{"id":39722,"date":"2025-01-19T22:34:48","date_gmt":"2025-01-19T20:34:48","guid":{"rendered":"https:\/\/evaggelatos.com\/?p=39722"},"modified":"2025-01-19T22:36:59","modified_gmt":"2025-01-19T20:36:59","slug":"t%ce%bf-%ce%bc%cf%85%ce%ba%cf%8c%cf%80%ce%bb%ce%b1%cf%83%ce%bc%ce%b1-%cf%84%ce%b7%cf%82-%cf%80%ce%bd%ce%b5%cf%85%ce%bc%ce%bf%ce%bd%ce%af%ce%b1%cf%82-%ce%b7%ce%bc%ce%bd%cf%81-%ce%ad%cf%87%ce%b5%ce%b9","status":"publish","type":"post","link":"https:\/\/evaggelatos.com\/?p=39722","title":{"rendered":"T\u03bf \u03bc\u03c5\u03ba\u03cc\u03c0\u03bb\u03b1\u03c3\u03bc\u03b1 \u03c4\u03b7\u03c2 \u03c0\u03bd\u03b5\u03c5\u03bc\u03bf\u03bd\u03af\u03b1\u03c2 \u0397\u039c\u03a1V (Human Mycoplasma Pneumoniae Virus) \u03ad\u03c7\u03b5\u03b9 \u03b9\u03c3\u03c7\u03c5\u03c1\u03ae \u03bc\u03b5\u03c4\u03b1\u03b4\u03bf\u03c4\u03b9\u03ba\u03cc\u03c4\u03b7\u03c4\u03b1 \u03ba\u03b1\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03cd\u03c0\u03bf\u03c0\u03c4\u03bf \u03b3\u03b9\u03b1 \u03ba\u03ac\u03b8\u03b5 \u03c0\u03c5\u03c1\u03b5\u03c4\u03cc, \u03b2\u03ae\u03c7\u03b1 \u03ba.\u03bb\u03c0. \u03c0\u03ad\u03c1\u03b1\u03bd \u03c4\u03c9\u03bd 48 \u03ce\u03c1\u03ce\u03bd"},"content":{"rendered":"<section class=\"pmc-layout__citation font-secondary font-xs\">\n<div>\n<div class=\"display-inline-block\"><button class=\"cursor-pointer text-no-underline bg-transparent border-0 padding-0 text-left margin-0 text-normal text-primary\" type=\"button\" aria-controls=\"journal_context_menu\" aria-expanded=\"false\">J Gen Fam Med<\/button><\/div>\n<p>. 2017 Apr 17;18(3):118\u2013125. doi: <a class=\"usa-link usa-link--external\" href=\"https:\/\/doi.org\/10.1002\/jgf2.15\" target=\"_blank\" rel=\"noopener noreferrer\" data-ga-action=\"click_feat_suppl\">10.1002\/jgf2.15<\/a><\/p>\n<\/div>\n<\/section>\n<section class=\"front-matter\">\n<div class=\"ameta p font-secondary font-xs\">\n<hgroup>\n<h1><em>Mycoplasma pneumoniae<\/em> infection: Basics<\/h1>\n<\/hgroup>\n<div class=\"cg p\"><a class=\"usa-link\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=%22Saraya%20T%22%5BAuthor%5D\" aria-describedby=\"id1\" aria-expanded=\"false\"><span class=\"name western\">Takeshi Saraya<\/span><\/a> <sup>1,<\/sup><sup>\u2709<\/sup><\/div>\n<ul class=\"d-buttons inline-list\">\n<li><\/li>\n<\/ul>\n<\/div>\n<\/section>\n<ul>\n<li><\/li>\n<li><\/li>\n<\/ul>\n<section aria-label=\"Article citation and metadata\">\n<section class=\"front-matter\">\n<div class=\"ameta p font-secondary font-xs\">\n<div class=\"d-panels font-secondary-light\"><\/div>\n<div>PMCID: PMC5689399\u00a0\u00a0PMID: <a class=\"usa-link\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/29264006\/\">29264006<\/a><\/div>\n<\/div>\n<\/section>\n<\/section>\n<section aria-label=\"Article content\">\n<section class=\"body main-article-body\">\n<section id=\"jgf215-abs-0001\" class=\"abstract\">\n<h2 data-anchor-id=\"jgf215-abs-0001\"><a id=\"jgf215-abs-0001-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-abs-0001\"><\/a>Abstract<\/h2>\n<p><em>Mycoplasma pneumoniae<\/em> (Mp) is one of the leading causes of community\u2010acquired pneumonia and can cause a number of extrapulmonary manifestations in the absence of pneumonia. In this regard, primary care physicians should know how to suspect, diagnose, and manage patients with Mp infection. This review gives a general overview of the basic clinical aspects of Mp infection with special reference to pneumonia, which will help further understanding of the disease.<\/p>\n<section id=\"kwd-group1\" class=\"kwd-group\"><strong>Keywords:<\/strong> clinical features, general overview, <em>Mycoplasma pneumoniae<\/em> pneumonia<\/section>\n<\/section>\n<section id=\"jgf215-sec-0001\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0001\"><a id=\"jgf215-sec-0001-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0001\"><\/a>1. Introduction<\/h2>\n<p>Mycoplasma and ureaplasma species are known to occur in humans. The term \u201cmycoplasma\u201d (Greek; \u201cmykes\u201d=fungus and \u201cplasma\u201d=formed) emerged in the 1950s<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0001\" aria-describedby=\"jgf215-bib-0001\" aria-expanded=\"false\">1<\/a> and replaced the older pleuropneumonia\u2010like organisms (PPLO) terminology. <em>Mycoplasma pneumoniae<\/em> (Mp) are 1\u20102\u00a0\u03bcm long and 0.1\u20100.2\u00a0\u03bcm wide, compared with a typical bacillus of 1\u20104\u00a0\u03bcm in length and 0.5\u20101.0\u00a0\u03bcm in width. The cell volume of Mp is less than 5% of that of a typical bacillus. Typical colonies of Mp, shown in Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0001\">1<\/a> like a \u201cfried egg\u201d on agar plates, rarely exceed 100\u00a0\u03bcm in diameter. Mp lacks a cell wall, which makes it intrinsically resistant to antimicrobials, such as beta\u2010lactams that work by targeting the\u00a0cell wall, and thus causes a wide spectrum of clinical symptoms and disease manifestations. This article focuses on the diverse clinical aspects of Mp infection, including a review of the current literature.<\/p>\n<figure id=\"jgf215-fig-0001\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 1.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-1\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/78f4c37b8cbe\/JGF2-18-118-g001.jpg\" alt=\"Figure 1\" width=\"709\" height=\"532\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0001\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Colonies of <em>Mycoplasma pneumoniae<\/em> on an agar plate typically have a unique \u201cfried egg\u201d (\u03c4\u03b7\u03b3\u03b1\u03bd\u03b7\u03c4\u03cc \u03b1\u03c5\u03b3\u03cc \u03c3\u03b1\u03bd \u03b5\u03bc\u03c6\u03ac\u03bd\u03b9\u03c3\u03b7) appearance<\/figcaption><\/figure>\n<\/section>\n<section id=\"jgf215-sec-0002\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0002\"><a id=\"jgf215-sec-0002-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0002\"><\/a>2. History of Isolation of <em>Mycoplasma pneumoniae<\/em><\/h2>\n<p>In 1938, Reimann reported seven patients with an unusual form of tracheobronchopneumonia and severe constitutional symptoms.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0002\" aria-describedby=\"jgf215-bib-0002\" aria-expanded=\"false\">2<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0003\" aria-describedby=\"jgf215-bib-0003\" aria-expanded=\"false\">3<\/a> He believed the clinical picture of this disease differed from that of diseases caused by influenza viruses or known bacteria and \u201cprimary atypical pneumonia\u201d was suspected. In the early 1940s, Eaton et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0004\" aria-describedby=\"jgf215-bib-0004\" aria-expanded=\"false\">4<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0005\" aria-describedby=\"jgf215-bib-0005\" aria-expanded=\"false\">5<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0006\" aria-describedby=\"jgf215-bib-0006\" aria-expanded=\"false\">6<\/a> identified an agent that was the principal cause of primary atypical pneumonia using cotton rats, hamsters, and chick embryos, which was referred to as the \u201cEaton agent.\u201d Chanock<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0007\" aria-describedby=\"jgf215-bib-0007\" aria-expanded=\"false\">7<\/a> succeeded in culturing the Eaton agent in mammalian cell\u2010free medium and proposed the taxonomic designation \u201c<em>Mycoplasma pneumoniae<\/em>\u201d in 1963. A more detailed history is available in two different articles, \u201cThe history of <em>Mycoplasma pneumoniae<\/em> pneumonia\u201d by Saraya<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0008\" aria-describedby=\"jgf215-bib-0008\" aria-expanded=\"false\">8<\/a> or by Marmion.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0009\" aria-describedby=\"jgf215-bib-0009\" aria-expanded=\"false\">9<\/a><\/p>\n<\/section>\n<section id=\"jgf215-sec-0003\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0003\"><a id=\"jgf215-sec-0003-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0003\"><\/a>3. Epidemiology<\/h2>\n<p>Mycoplasma infections occur sporadically throughout the year, and widespread community outbreaks can occur. The Japanese Respiratory Society (JRS) reports that the frequency of Mp pneumonia among patients with community\u2010acquired pneumonia (CAP) is approximately 5.2%\u201027.4%.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0010\" aria-describedby=\"jgf215-bib-0010\" aria-expanded=\"false\">10<\/a> Mp is one of the most common pathogens that cause community\u2010acquired pneumonia. The first and largest prospective multicenter study involving 156 Japanese medical institutions looking at atypical pneumonia in Japan was conducted between April 2005 and September 2008.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0011\" aria-describedby=\"jgf215-bib-0011\" aria-expanded=\"false\">11<\/a> This study examined 223 patients with Mp pneumonia who were equally distributed with regard to gender, and the mean age was 37.9\u00b116.6 (mean\u00b1SD)\u00a0years.<\/p>\n<p>Importantly, macrolide\u2010resistant Mp was first isolated from Japanese children in 2000<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0012\" aria-describedby=\"jgf215-bib-0012\" aria-expanded=\"false\">12<\/a> and in adults in 2007, all of whom possessed a 23S\u2010rRNA mutation. In the 2000s, the prevalence of macrolide\u2010resistant Mp having either an A2063G or an A2064G mutation rapidly increased in Japan<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0013\" aria-describedby=\"jgf215-bib-0013\" aria-expanded=\"false\">13<\/a> as well as in East Asia, with a notably high isolation rate (92%) in China (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0002\">2<\/a>).<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a><\/p>\n<figure id=\"jgf215-fig-0002\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 2.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-3\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/934513b51e4d\/JGF2-18-118-g002.jpg\" alt=\"Figure 2\" width=\"709\" height=\"594\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0002\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Proportions of macrolide\u2010resistant <em>Mycoplasma pneumoniae<\/em> in individual countries. Data are cited from Ref. <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a><\/figcaption><\/figure>\n<\/section>\n<section id=\"jgf215-sec-0004\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0004\"><a id=\"jgf215-sec-0004-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0004\"><\/a>4. Clinical Features<\/h2>\n<p>Most patients with Mp infection present with minor respiratory illness, including pharyngitis and tracheobronchitis, and the infection is usually self\u2010limited. Only 3%\u201013% of infected persons develop pneumonia. The illness spreads via droplets and tends to spread in families with an incubation period of 2\u20104\u00a0weeks. The greatest risk of infection is in young persons aged 5\u201020\u00a0years old. Lind et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0015\" aria-describedby=\"jgf215-bib-0015\" aria-expanded=\"false\">15<\/a> suggested that herd immunity lasts about 4\u00a0years (range: 2\u201010\u00a0years) before people are again susceptible to Mp infection. Thus, only partial immunity may follow infections, and repeated infections can occur in the same person. In addition, persons with hypogammaglobulinemia have an increased susceptibility to Mp infections, and those with sickle cell disease may experience more severe illness.<\/p>\n<\/section>\n<section id=\"jgf215-sec-0005\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0005\"><a id=\"jgf215-sec-0005-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0005\"><\/a>5. Mp Pneumonia<\/h2>\n<p>The clinical findings of Mp pneumonia are diverse<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0016\" aria-describedby=\"jgf215-bib-0016\" aria-expanded=\"false\">16<\/a> (Table <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0001\">1<\/a>) and are characterized by the insidious onset of fever, malaise, headache, and cough. The persistent cough is the clinical hallmark of Mp infection, of which the severity and frequency increase over the next 1\u20102\u00a0days, and which may become debilitating. Mp infection has similar clinical findings to those of respiratory viruses including but not limited to influenza and adenovirus. However, Mp pneumonia is different from those viral infections in that it has a more gradual onset of symptoms and that diarrhea, nausea, and vomiting are unusual. Interestingly, compared with pneumococcal pneumonia, pleuritic pain and shaking chills are relatively rare.<\/p>\n<section id=\"jgf215-tbl-0001\" class=\"tw xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Table 1.<\/h3>\n<div class=\"caption p\">\n<p>Frequencies of clinical findings in Mp pneumonia<\/p>\n<\/div>\n<div class=\"tbl-box p\" tabindex=\"0\">\n<table class=\"content\" frame=\"hsides\" rules=\"groups\">\n<colgroup>\n<col span=\"1\" \/>\n<col span=\"1\" \/> <\/colgroup>\n<thead valign=\"top\">\n<tr>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">Findings<\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"center\" valign=\"top\">Frequency (%)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td colspan=\"2\" rowspan=\"1\" align=\"left\">Symptom<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Cough<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">93\u2013100<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Malaise<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">74\u201389<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Headache<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">60\u201384<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Chilliness<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">58\u201378<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Sore throat<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">53\u201371<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Chest discomfort<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">42\u201369<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Nasal symptoms<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">29\u201369<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Myalgias<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">45<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" rowspan=\"1\" align=\"left\">Sign<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Fever<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">96\u2013100<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Rales, wheezes<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">80\u201384<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Pharyngeal erythema (without exudate)<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">12\u201373<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Cervical adenopathy<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">18\u201327<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/table\/jgf215-tbl-0001\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div>\n<div class=\"tw-foot p\">\n<div id=\"jgf215-note-0001\" class=\"fn\">\n<p>Table is from Ref. <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0015\" aria-describedby=\"jgf215-bib-0015\" aria-expanded=\"false\">15<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p>Goto reported that almost all patients with Mp pneumonia were classified as having mild (85.5%) or moderate (14.0%) infection based on the A\u2010DROP severity score (A, age; D, dehydration; R, respiration; O, orientation; P, blood pressure) by the Committee for the JRS Guidelines for the management of respiratory infections.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0017\" aria-describedby=\"jgf215-bib-0017\" aria-expanded=\"false\">17<\/a> The A\u2010DROP score classifies the infection as mild (score: 0), moderate (score: 1\u20102), severe (score 3), and very severe (score 4\u20105). The mean baseline body temperature of patients with Mp pneumonia was 37.7\u00b11.0\u00b0C. This trend was similar to our single\u2010center retrospective study performed between January 2006 and November 2013, gathering 65 Mp pneumonia patients (Table\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0002\">2<\/a>).<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0018\" aria-describedby=\"jgf215-bib-0018\" aria-expanded=\"false\">18<\/a> Among all 65 patients, hypoxemia was noted in only 12.8% (n=5), and body temperature was 37.9\u00b11.3\u00b0C.<\/p>\n<section id=\"jgf215-tbl-0002\" class=\"tw xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Table 2.<\/h3>\n<div class=\"caption p\">\n<p>Characteristics of 65 patients with Mp pneumonia<\/p>\n<\/div>\n<div class=\"tbl-box p\" tabindex=\"0\">\n<table class=\"content\" frame=\"hsides\" rules=\"groups\">\n<colgroup>\n<col span=\"1\" \/>\n<col span=\"1\" \/> <\/colgroup>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Total number of patients<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">65<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Age (mean\u00b1SD)<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">34.1\u00b115.2<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Less than 40\u00a0years old<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">72.3% (n=47)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Male<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">32.3% (n=21)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Smoker<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">39.1% (n=18)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Underlying disease<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">43.5% (n=20)<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">ADROP score (\u22653)<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"center\">0% (n=0)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/table\/jgf215-tbl-0002\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div>\n<\/section>\n<p>On physical examination, more than half of the patients with Mp pneumonia had no audible crackles and were likely to have late inspiratory crackles.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0019\" aria-describedby=\"jgf215-bib-0019\" aria-expanded=\"false\">19<\/a> Therefore, primary care physicians should be aware of these six factors that help discriminate Mp pneumonia from other causes of CAP using the JRS \u201cdiagnostic tests\u201d<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0010\" aria-describedby=\"jgf215-bib-0010\" aria-expanded=\"false\">10<\/a> (Table\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0004\">4<\/a>).<\/p>\n<section id=\"jgf215-tbl-0004\" class=\"tw xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Table 4.<\/h3>\n<div class=\"caption p\">\n<p>Characteristics of patients with Mp pneumonia<\/p>\n<\/div>\n<div class=\"tbl-box p\" tabindex=\"0\">\n<table class=\"content\" frame=\"hsides\" rules=\"groups\">\n<colgroup>\n<col span=\"1\" \/> <\/colgroup>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Items used for diagnosis<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Under 60\u00a0y of age<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">No or minor underlying disease<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Stubborn cough<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Poor chest auscultatory findings<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">No sputum or etiological agent identified by rapid diagnosis<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">A peripheral white blood cell count &lt;10 000\/\u03bcL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/table\/jgf215-tbl-0004\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div>\n<\/section>\n<\/section>\n<section id=\"jgf215-sec-0006\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0006\"><a id=\"jgf215-sec-0006-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0006\"><\/a>6. Macrolide\u2010Resistant Mp Pneumonia<\/h2>\n<p>Macrolide\u2010resistant (MR) Mp emerged and became widespread in East Asia after 2000. Persistent fever for more than 48\u00a0h after initiation of a macrolide may suggest the presence of MR\u2010Mp. In Japan, 87% of all pediatric Mp infections are due to MR\u2010Mp<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0020\" aria-describedby=\"jgf215-bib-0020\" aria-expanded=\"false\">20<\/a> while the prevalence in adult patients seems to be over 30%, mainly due to an A2063G mutation.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0021\" aria-describedby=\"jgf215-bib-0021\" aria-expanded=\"false\">21<\/a> Determination of MR\u2010Mp is difficult without application of the test for 23S rRNA mutations. However, the duration of febrile illness in patients with MR\u2010Mp pneumonia was significantly longer (4.1\u00b12.3\u00a0days) than in patients with macrolide\u2010susceptible (MS) Mp disease (1.6\u00b10.8\u00a0days).<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0013\" aria-describedby=\"jgf215-bib-0013\" aria-expanded=\"false\">13<\/a> Similarly, Suzuki et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0022\" aria-describedby=\"jgf215-bib-0022\" aria-expanded=\"false\">22<\/a> reported that patients with MR\u2010Mp pneumonia have a longer duration of febrile illness and the number of febrile days during macrolide administration (median; 8\u00a0days, 3\u00a0days) than patients with MS\u2010Mp pneumonia (median; 5\u00a0days, 1\u00a0day). Another study showed that the numbers of febrile days or coughing days from the start of macrolide treatment were significantly longer in patients with MR\u2010Mp (mean; 4\u00a0days, 11.4\u00a0days) than in patients with MS\u2010Mp (mean 1.5\u00a0days, 7\u00a0days).<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0023\" aria-describedby=\"jgf215-bib-0023\" aria-expanded=\"false\">23<\/a> This suggests that if Mp\u2010infected patients have persistent fever for 48\u00a0h or more after initiation of macrolide therapy, we should be aware of the possibility of MR\u2010Mp infection.<\/p>\n<p>Life\u2010threatening illness is extremely rare, and there are no apparent risk factors for fulminant Mp pneumonia.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0024\" aria-describedby=\"jgf215-bib-0024\" aria-expanded=\"false\">24<\/a><\/p>\n<\/section>\n<section id=\"jgf215-sec-0007\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0007\"><a id=\"jgf215-sec-0007-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0007\"><\/a>7. Extrapulmonary Manifestations<\/h2>\n<p>Our preliminary data showed the typical diverse symptoms of Mp pneumonia (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0003\">3<\/a>). About 70% of patients experienced fever and cough (typically dry cough). Interestingly, 7% of patients had dermatologic involvement. Importantly, extrapulmonary manifestations due to Mp infection sometimes occur in the absence of Mp pneumonia or even in the absence of respiratory symptoms.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0025\" aria-describedby=\"jgf215-bib-0025\" aria-expanded=\"false\">25<\/a> As seen in Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0004\">4<\/a>, Mp infections cause various extrapulmonary complications, such as neurologic, cardiovascular, dermatological, digestive, hematological, and musculoskeletal manifestations, as well as others. <strong>Neurologic complications include encephalitis, meningoencephalitis, aseptic meningitis, myelitis, polyradiculitis, and <span style=\"font-size: 18pt;\">psychosis<\/span>.<\/strong> Central nervous system manifestations occur in less than 1 per 1000 cases and are most often noted in hospitalized patients.<strong> Guillain\u2010Barr\u00e9 syndrome and peripheral neuropathy have also both been reported.<\/strong> The pathogenesis of CNS involvement is unknown, but direct invasion of organisms, generation of toxins, and autoimmunity (production of autoantibodies) are possible mechanisms.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0026\" aria-describedby=\"jgf215-bib-0026\" aria-expanded=\"false\">26<\/a> Cardiovascular manifestations include<strong> pericarditis, endocarditis, and myocarditis.<\/strong> The signs and symptoms are arrhythmia, congestive failure, chest pain, and electrocardiographic abnormalities, particularly conduction defects. In patients with pericarditis, Mp is frequently isolated from the pericardial fluid and\/or tissue.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0025\" aria-describedby=\"jgf215-bib-0025\" aria-expanded=\"false\">25<\/a> Regarding skin conditions, Stevens\u2010Johnson syndrome and erythema multiforme are associated with Mp infection. Hepatic involvement has also been reported, characterized by liver dysfunction 7\u201010\u00a0days after the onset of fever. However, our preliminary data included both children (n=72) and adults (n=54) with Mp pneumonia who rarely showed derangement of serum alanine aminotransferase. On the other hand, the frequency of elevation of aspartate aminotransferase was significantly higher in children than in adults, which might reflect mild rhabdomyolysis as a result of musculoskeletal involvement. Among hematological manifestations, autoimmune hemolytic anemia is the most common indirect extrapulmonary involvement. Other diseases, such as hemophagocytic syndrome, are recognized as cytokine\u2010storm disorders, and a <strong>hypercoagulable state can present as disseminated intravascular coagulation. Musculoskeletal diseases such as arthritis and rhabdomyolysis are rare but can be seen<\/strong>. Other diseases <strong>(mucositis, otitis media, and glomerulonephritis)<\/strong> are also sporadically recognized.<\/p>\n<figure id=\"jgf215-fig-0003\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 3.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-5\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/ce0c25353dae\/JGF2-18-118-g003.jpg\" alt=\"Figure 3\" width=\"709\" height=\"617\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0003\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Symptoms of 54 patients with <em>Mycoplasma pneumoniae<\/em> pneumonia treated at Kyorin University<\/figcaption><\/figure>\n<figure id=\"jgf215-fig-0004\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 4.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-7\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/25c04a434f70\/JGF2-18-118-g004.jpg\" alt=\"Figure 4\" width=\"709\" height=\"386\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0004\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Classification of <em>Mycoplasma pneumoniae<\/em> infection with or without extrapulmonary involvement. DIC, disseminated intravascular coagulation<\/figcaption><\/figure>\n<\/section>\n<section id=\"jgf215-sec-0008\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0008\"><a id=\"jgf215-sec-0008-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0008\"><\/a>8. Pathogenesis of Mp Pneumonia<\/h2>\n<p>The severity of Mp respiratory disease appears to be related to the degree to which the host immune response reacts to the infection. This was confirmed by our \u201cmice models\u201d for Mp pneumonia sensitized with various conditions.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0027\" aria-describedby=\"jgf215-bib-0027\" aria-expanded=\"false\">27<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0028\" aria-describedby=\"jgf215-bib-0028\" aria-expanded=\"false\">28<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0029\" aria-describedby=\"jgf215-bib-0029\" aria-expanded=\"false\">29<\/a> Mp attaches to bronchial epithelial cells, mediated by a surface adhesion molecule, the P1 protein.<\/p>\n<p>Several virulence mechanisms of Mp have been recognized, including (i) lipoproteins\/lipopeptides, (ii) community\u2010acquired respiratory distress syndrome (CARDS) toxin, and (iii) other factors (hemolysin, hydrogen peroxide, and superoxide radicals) (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0005\">5<\/a>). Mp has lipoproteins\/lipopeptides with potent inflammatory properties, which are recognized by host immune systems (ie, bronchial epithelial cells and alveolar macrophages) via Toll\u2010like receptors TLR1, TLR2, and TLR6.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0027\" aria-describedby=\"jgf215-bib-0027\" aria-expanded=\"false\">27<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0030\" aria-describedby=\"jgf215-bib-0030\" aria-expanded=\"false\">30<\/a> Recently, Shimizu et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0031\" aria-describedby=\"jgf215-bib-0031\" aria-expanded=\"false\">31<\/a> reported that TLR4 and autophagy played important roles in the induction of the TLR2\u2010independent pathway. Recently, CARDS toxin was recognized by Kannan et\u00a0al.,<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0032\" aria-describedby=\"jgf215-bib-0032\" aria-expanded=\"false\">32<\/a> which is involved in the pathophysiology of Mp disease. The toxin binds to human surfactant protein A and annexin A2 on airway\u00a0epithelial cells\u00a0and is internalized, leading to a range of pathogenetic events.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0033\" aria-describedby=\"jgf215-bib-0033\" aria-expanded=\"false\">33<\/a> Other factors are well known for their harmful effects via oxidative stress.<\/p>\n<figure id=\"jgf215-fig-0005\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 5.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-9\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/5975eb8b491d\/JGF2-18-118-g005.jpg\" alt=\"Figure 5\" width=\"709\" height=\"1057\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0005\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Postulated schema for generating process in human <em>Mycoplasma pneumoniae<\/em> pneumonia. CARDS, community\u2010acquired respiratory distress syndrome; TNF, tumor necrosis factor; RANTES, regulated on activation, normal T cell expressed and secreted; MCP\u20101, monocyte chemotactic protein\u20101. Figure cited from Ref. <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a><\/figcaption><\/figure>\n<\/section>\n<section id=\"jgf215-sec-0009\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0009\"><a id=\"jgf215-sec-0009-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0009\"><\/a>9. Association of <em>Mycoplasma pneumoniae<\/em> with Bronchial Asthma<\/h2>\n<p>Several reports have described that Mp infection may be associated with pediatric asthma exacerbation<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0034\" aria-describedby=\"jgf215-bib-0034\" aria-expanded=\"false\">34<\/a> more often than in adults.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0035\" aria-describedby=\"jgf215-bib-0035\" aria-expanded=\"false\">35<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0036\" aria-describedby=\"jgf215-bib-0036\" aria-expanded=\"false\">36<\/a> Yano et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0037\" aria-describedby=\"jgf215-bib-0037\" aria-expanded=\"false\">37<\/a> reported that mycoplasmal respiratory infections on the airway involved a complex interplay of airway inflammation via Mp\u2010specific IgE\u2010mediated hypersensitivity, resulted in the initial asthmatic symptoms. Kraft et\u00a0al.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0038\" aria-describedby=\"jgf215-bib-0038\" aria-expanded=\"false\">38<\/a> stated that Mp can be detected even in the airways of chronic, stable adult asthma patients. Thus, latent Mp infection and the asymptomatic carrier state may play a role in the pathogenesis of chronic asthma or asthma exacerbation. However, our data suggest that asthma exacerbation is not associated with Mp infection but rather with viral infection (ie, human rhinovirus, human metapneumovirus, and respiratory syncytial virus) in up to approximately 50% of hospitalized asthmatic patients.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0039\" aria-describedby=\"jgf215-bib-0039\" aria-expanded=\"false\">39<\/a><\/p>\n<\/section>\n<section id=\"jgf215-sec-0010\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0010\"><a id=\"jgf215-sec-0010-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0010\"><\/a>10. Human Pathology and Bronchoalveolar Lavage Fluid Findings<\/h2>\n<p>The pathological findings of Mp pneumonia have scarcely been reported. However, several reports have discussed different tissue\u2010based diagnostic techniques, such as transbronchial lung biopsy,<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0040\" aria-describedby=\"jgf215-bib-0040\" aria-expanded=\"false\">40<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0041\" aria-describedby=\"jgf215-bib-0041\" aria-expanded=\"false\">41<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0042\" aria-describedby=\"jgf215-bib-0042\" aria-expanded=\"false\">42<\/a> video\u2010assisted thoracoscopic surgery,<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0043\" aria-describedby=\"jgf215-bib-0043\" aria-expanded=\"false\">43<\/a> open lung biopsy,<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0044\" aria-describedby=\"jgf215-bib-0044\" aria-expanded=\"false\">44<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0045\" aria-describedby=\"jgf215-bib-0045\" aria-expanded=\"false\">45<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0046\" aria-describedby=\"jgf215-bib-0046\" aria-expanded=\"false\">46<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0047\" aria-describedby=\"jgf215-bib-0047\" aria-expanded=\"false\">47<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0048\" aria-describedby=\"jgf215-bib-0048\" aria-expanded=\"false\">48<\/a> and autopsy.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0049\" aria-describedby=\"jgf215-bib-0049\" aria-expanded=\"false\">49<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0050\" aria-describedby=\"jgf215-bib-0050\" aria-expanded=\"false\">50<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0051\" aria-describedby=\"jgf215-bib-0051\" aria-expanded=\"false\">51<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0052\" aria-describedby=\"jgf215-bib-0052\" aria-expanded=\"false\">52<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0053\" aria-describedby=\"jgf215-bib-0053\" aria-expanded=\"false\">53<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0054\" aria-describedby=\"jgf215-bib-0054\" aria-expanded=\"false\">54<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0055\" aria-describedby=\"jgf215-bib-0055\" aria-expanded=\"false\">55<\/a> According to those previous reports, the characteristic pathological feature of Mp pneumonia is a marked plasma cell\u2010rich lymphocytic infiltration in the peribronchovascular areas (PBVAs) with accumulations of macrophages, neutrophils, and lymphocytes in the alveolar spaces.<\/p>\n<p>Interestingly, bronchoalveolar lavage fluid analysis of Mp pneumonia has scarcely been reported until recently.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0056\" aria-describedby=\"jgf215-bib-0056\" aria-expanded=\"false\">56<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0057\" aria-describedby=\"jgf215-bib-0057\" aria-expanded=\"false\">57<\/a> Those few studies demonstrated that PMNs and lymphocytes increased more than other cell types. The elevation of CD4\u2010to\u2010CD8 ratios in the bronchoalveolar lavage fluid (BALF) was noted and ranged from 2.1<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0056\" aria-describedby=\"jgf215-bib-0056\" aria-expanded=\"false\">56<\/a> to 3.5\u00b12.1<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0057\" aria-describedby=\"jgf215-bib-0057\" aria-expanded=\"false\">57<\/a> at various sampling times.<\/p>\n<\/section>\n<section id=\"jgf215-sec-0011\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0011\"><a id=\"jgf215-sec-0011-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0011\"><\/a>11. Diagnostic Methods<\/h2>\n<p>Although the presence of cold agglutinins is not specific, a titer of 1:64 or more is suggestive of Mp infection. Culture is the gold standard method for diagnosis of Mp infection; however, it requires 1\u20102\u00a0weeks for definitive results and is rarely carried out. Serological methods such as particle agglutination (PA), complement fixation (CF), and rapid diagnosis such as ImmunoCard<sup>\u00ae<\/sup> (IC) (mycoplasma immunoglobulin M [IgM]) are commercially available. The loop\u2010mediated isothermal amplification (LAMP) method and a rapid antigen test (Ribotest; Asahi Kasei Pharma Corp, Japan)<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0058\" aria-describedby=\"jgf215-bib-0058\" aria-expanded=\"false\">58<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0059\" aria-describedby=\"jgf215-bib-0059\" aria-expanded=\"false\">59<\/a> using throat swabs are also commercially available.<\/p>\n<p>If either CF titers are higher than 1:64 or PA titers are higher than 1:320, a diagnosis of Mp infection can be made. In previous reports, the results of the IC Mycoplasma test were not concordant with that of the PA test, especially in adults,<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0060\" aria-describedby=\"jgf215-bib-0060\" aria-expanded=\"false\">60<\/a> which requires a fourfold rise in titers for a diagnosis to be made in adults (Table\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0003\">3<\/a>).<\/p>\n<section id=\"jgf215-tbl-0003\" class=\"tw xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Table 3.<\/h3>\n<div class=\"caption p\">\n<p>Diagnostic methods for Mp pneumonia<\/p>\n<\/div>\n<div class=\"tbl-box p\" tabindex=\"0\">\n<table class=\"content\" frame=\"hsides\" rules=\"groups\">\n<colgroup>\n<col span=\"1\" \/>\n<col span=\"1\" \/>\n<col span=\"1\" \/> <\/colgroup>\n<thead valign=\"top\">\n<tr>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">Diagnostic method<\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">Diagnostic criteria<\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\"><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td colspan=\"3\" rowspan=\"1\" align=\"left\">Antibody levels<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"2\" align=\"left\">PA<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Single<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">\u22651:320 titer<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Pair<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">\u00d74<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"2\" align=\"left\">CF<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Single<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">\u22651:64 titer<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Pair<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">\u00d74<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Culture<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">ImmunoCard<sup>\u00ae<\/sup><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">PCR<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">LAMP<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Rapid antigen test (Ribotest)<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/table\/jgf215-tbl-0003\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div>\n<\/section>\n<p>Although a few laboratories can use PCR\u2010based diagnostics, the sensitivity and specificity for Mp infection are 40.7%\u201066.7% and 88.8%\u201098.5%, respectively, with the serological diagnosis used as the reference standard.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0014\" aria-describedby=\"jgf215-bib-0014\" aria-expanded=\"false\">14<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0061\" aria-describedby=\"jgf215-bib-0061\" aria-expanded=\"false\">61<\/a> The LAMP assay, a novel nucleic acid amplification method for the rapid detection of Mp by throat swab, was recently developed and became commercially available in 2010 in Japan with the same sensitivity and specificity for detecting Mp as PCR.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0062\" aria-describedby=\"jgf215-bib-0062\" aria-expanded=\"false\">62<\/a> When the results of serological tests were considered as the standard, the sensitivity, specificity, and positive and negative predictive values of the LAMP assay were 94.8%, 91.9%, 91.1%, and 95.2%, respectively.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0063\" aria-describedby=\"jgf215-bib-0063\" aria-expanded=\"false\">63<\/a> The median duration of pharyngeal carriage, as measured by the LAMP assay, was 9.5\u00a0days. When the LAMP assay is compared to a validated real\u2010time PCR test, the sensitivity of the LAMP assay was 88.5% tested on extracted nucleic acid and 82.1% evaluated on unextracted clinical specimens.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0064\" aria-describedby=\"jgf215-bib-0064\" aria-expanded=\"false\">64<\/a> In this regard, the LAMP assay will enable rapid (within a few hours), low\u2010cost detection of Mp infection. Optimal sample site varies in terms of pathogens or age. Sputum may be superior to nasopharyngeal swabs or oropharyngeal swabs in detection of Mp by nucleic acid amplification method from adults patients.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0065\" aria-describedby=\"jgf215-bib-0065\" aria-expanded=\"false\">65<\/a><\/p>\n<p>Ribotest Mp (Asahi Kasei Pharma Corp), a rapid antigen kit for the detection of the Mp ribosomal protein L7\/L12 using an immunochromatographic assay, became available in Japan in 2013. Another study showed the threshold of Mp for this test was 1.1\u00d710<sup>4\u00a0<\/sup>cfu\/mL.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0058\" aria-describedby=\"jgf215-bib-0058\" aria-expanded=\"false\">58<\/a> However,\u00a0the diagnostic sensitivity of\u00a0the Ribotest\u00a0compared with PCR was not high, at approximately 60%.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0059\" aria-describedby=\"jgf215-bib-0059\" aria-expanded=\"false\">59<\/a> From this perspective, the diagnosis of Mp pneumonia should be based on the following six factors proposed by the JRS<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0017\" aria-describedby=\"jgf215-bib-0017\" aria-expanded=\"false\">17<\/a>: (i) &lt;60\u00a0years of age; (ii) absence of or only minor underlying disease; (iii) stubborn cough; (iv) abnormal findings on chest auscultation; (v) absence of sputum or presence of an identifiable etiological agent by rapid diagnostic testing; and (vi) peripheral white blood cell count &lt;10 000\/\u03bcL (Table\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0004\">4<\/a>). If four or more of the proposed factors are present, Mp pneumonia can be easily discriminated from the other pathogens with high sensitivity (88.7%) and moderate specificity (77.5%).<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0066\" aria-describedby=\"jgf215-bib-0066\" aria-expanded=\"false\">66<\/a><\/p>\n<\/section>\n<section id=\"jgf215-sec-0012\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0012\"><a id=\"jgf215-sec-0012-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0012\"><\/a>12. Radiological Features<\/h2>\n<p>In our unpublished data, a prominent feature of chest X\u2010ray, both in children and adults with Mp pneumonia, was consolidation followed by ground glass opacities, which was predominantly seen in the middle to lower lung fields.<\/p>\n<p>Regarding thoracic computed tomography of Mp pneumonia, only several small case series have been reported so far. The radiological findings are diverse; however, consolidation (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0006\">6<\/a>A), ground glass opacities (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0006\">6<\/a>B), and bronchovascular bundle thickening (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0006\">6<\/a>C) with peribronchovascular (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0006\">6<\/a>B,C) or centrilobular nodules (Figure\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-fig-0006\">6<\/a>D) are prominent features of Mp pneumonia.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0018\" aria-describedby=\"jgf215-bib-0018\" aria-expanded=\"false\">18<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0067\" aria-describedby=\"jgf215-bib-0067\" aria-expanded=\"false\">67<\/a>, <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0068\" aria-describedby=\"jgf215-bib-0068\" aria-expanded=\"false\">68<\/a> In differentiating from <em>Streptococcus pneumoniae<\/em> pneumonia, the presence of centrilobular nodules indicates Mp pneumonia.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0018\" aria-describedby=\"jgf215-bib-0018\" aria-expanded=\"false\">18<\/a><\/p>\n<figure id=\"jgf215-fig-0006\" class=\"fig xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Figure 6.<\/h3>\n<p class=\"img-box line-height-none margin-x-neg-2 tablet:margin-x-0 text-center\"><img loading=\"lazy\" decoding=\"async\" id=\"nlm-graphic-11\" class=\"graphic\" src=\"https:\/\/cdn.ncbi.nlm.nih.gov\/pmc\/blobs\/c0f3\/5689399\/50f1411c010d\/JGF2-18-118-g006.jpg\" alt=\"Figure 6\" width=\"709\" height=\"499\" \/><\/p>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/figure\/jgf215-fig-0006\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div><figcaption>Thoracic computed tomography demonstrates massive consolidation in the left lower lung lobe with air bronchograms (A), GGO in the peribronchovascular area (B, C) with thickening of bronchovascular bundles (C). (D) shows centrilobular nodules with bronchial thickening. GGO, ground glass opacity<\/figcaption><\/figure>\n<\/section>\n<section id=\"jgf215-sec-0013\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0013\"><a id=\"jgf215-sec-0013-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0013\"><\/a>13. Treatment<\/h2>\n<p><strong>Macrolides have direct effects on neutrophil function and production of cytokines involved in inflammation cascades.<\/strong> They have an oral bioavailability of 50% and tissue concentrations of up to 300\u2010fold the serum concentration in the epithelial lining fluid, alveolar macrophages, and neutrophils.<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0069\" aria-describedby=\"jgf215-bib-0069\" aria-expanded=\"false\">69<\/a> For Mp infections, 14\u2010 or 15\u2010membered ring macrolides are usually considered the first\u2010line agents, which are well known for anti\u2010inflammatory, immunomodulative effects.<\/p>\n<p>Although JRS guidelines do not refer to the treatment regimen for Mp pneumonia<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0010\" aria-describedby=\"jgf215-bib-0010\" aria-expanded=\"false\">10<\/a> (Table <a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0005\">5<\/a>), the Japanese Society of Mycoplasmology<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0070\" aria-describedby=\"jgf215-bib-0070\" aria-expanded=\"false\">70<\/a> recommends the first\u2010line therapy (oral clarithromycin [CAM] 200\u00a0mg bid for 7\u201010\u00a0days or azithromycin [AZM] 2\u00a0g once only or AZM 500\u00a0mg\/d for three days or erythromycin [EM] 800\u00a0mg\u20101200\u00a0mg\/d for 7\u201010\u00a0days) and second\u2010line oral therapy (minomycin [MINO] 200\u00a0mg\/d or fluoroquinolones for 7\u201010\u00a0days) as an outpatient. In the inpatient setting, the Society recommends intravenous treatment with MINO 200\u00a0mg\/d or EM 600\u00a0mg\u20101500\u00a0mg\/d for 7\u201010\u00a0days or AZM 500\u00a0mg once only as first\u2010line therapy, and intravenous fluoroquinolones as second\u2010line therapy. Systemic steroid treatment as additive therapy may improve the outcome of severe Mp pneumonia, but the effects are controversial.<\/p>\n<section id=\"jgf215-tbl-0005\" class=\"tw xbox font-sm\" lang=\"en\">\n<h3 class=\"obj_head\">Table 5.<\/h3>\n<div class=\"caption p\">\n<p>Recommended treatment for Mp pneumonia based on different individual guidelines<\/p>\n<\/div>\n<div class=\"tbl-box p\" tabindex=\"0\">\n<table class=\"content\" frame=\"hsides\" rules=\"groups\">\n<colgroup>\n<col span=\"1\" \/>\n<col span=\"1\" \/>\n<col span=\"1\" \/>\n<col span=\"1\" \/> <\/colgroup>\n<thead valign=\"top\">\n<tr>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\"><\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">JRS<\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">IDSA\/ATS<\/th>\n<th colspan=\"1\" rowspan=\"1\" align=\"left\" valign=\"top\">BTS<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">First line<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">No description<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Macrolides<br \/>\nTetracycline<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Clarithromycin<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Alternative<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">No description<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Fluoroquinolone<\/td>\n<td colspan=\"1\" rowspan=\"1\" align=\"left\">Doxycycline<br \/>\nFluoroquinolone<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"p text-right font-secondary\"><a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/table\/jgf215-tbl-0005\/\" target=\"_blank\" rel=\"noopener noreferrer\">Open in a new tab<\/a><\/div>\n<div class=\"tw-foot p\">\n<div id=\"jgf215-note-0002\" class=\"fn\">\n<p>JRS, Japanese Respiratory Society; IDSA, Infectious Diseases Society of America; ATS, American Thoracic Society; BTS, British Thoracic Society.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p>If the fever persists for 48\u201072\u00a0h after the initiation of macrolides, oral or intravenous MINO 200\u00a0mg\/d is recommended as MR\u2010Mp therapy, both in outpatient and inpatient settings. The recommended treatment for Mp pneumonia by Infectious Diseases Society of America\/American Thoracic Society<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0070\" aria-describedby=\"jgf215-bib-0070\" aria-expanded=\"false\">70<\/a> or British Thoracic Society guidelines<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-bib-0071\" aria-describedby=\"jgf215-bib-0071\" aria-expanded=\"false\">71<\/a> is shown in Table\u00a0<a class=\"usa-link\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5689399\/#jgf215-tbl-0005\">5<\/a>. These treatments are intended for broad\u2010spectrum initial coverage and do not intend to differentiate the atypical pathogens from other CAP pathogens at the time of initial treatment.<\/p>\n<p>Mp pneumonia can manifest diverse clinical effects, and the diagnosis can sometimes be challenging for primary care physicians. However, an understanding and recognition of the wide variety of clinical manifestations of Mp infection can lead to more accurate diagnosis and effective treatment.<\/p>\n<\/section>\n<section id=\"jgf215-sec-0015\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0015\"><a id=\"jgf215-sec-0015-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0015\"><\/a>Conflict of Interest<\/h2>\n<p>The authors have stated explicitly that there are no conflicts of interest in connection with this article.<\/p>\n<\/section>\n<section id=\"jgf215-sec-0014\" class=\"ack\">\n<h2 class=\"pmc_sec_title\" data-anchor-id=\"jgf215-sec-0014\"><a id=\"jgf215-sec-0014-anchor\" class=\"usa-anchor\" data-anchor-id=\"jgf215-sec-0014\"><\/a>Acknowledgement<\/h2>\n<p>I am very grateful to Satoshi Kurata (Kyorin University School of Medicine, Department of Infectious diseases) who kindly provided a picture of Mp colonies.<\/p>\n<\/section>\n<section id=\"notes1\">Saraya T. <em>Mycoplasma pneumoniae<\/em> infection: Basics. 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Thorax. 2009;64(suppl 3):iii1\u201355.<\/cite> [<a class=\"usa-link usa-link--external\" href=\"https:\/\/doi.org\/10.1136\/thx.2009.121434\" target=\"_blank\" rel=\"noopener noreferrer\" data-ga-action=\"click_feat_suppl\">DOI<\/a>] [<a class=\"usa-link\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/19783532\/\">PubMed<\/a>] [<a class=\"usa-link usa-link--external\" href=\"https:\/\/scholar.google.com\/scholar_lookup?journal=Thorax&amp;title=BTS%20guidelines%20for%20the%20management%20of%20community%20acquired%20pneumonia%20in%20adults:%20update%202009&amp;author=WS%20Lim&amp;author=SV%20Baudouin&amp;author=RC%20George&amp;volume=64&amp;issue=suppl%203&amp;publication_year=2009&amp;pages=iii1-55&amp;pmid=19783532&amp;doi=10.1136\/thx.2009.121434&amp;\" target=\"_blank\" rel=\"noopener noreferrer\" data-ga-action=\"click_feat_suppl\">Google Scholar<\/a>]<\/li>\n<\/ul>\n<\/section>\n<\/section>\n<\/section>\n<footer class=\"p courtesy-note font-secondary font-sm text-center\">\n<hr class=\"headless\" \/>\n<\/footer>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>J Gen Fam Med . 2017 Apr 17;18(3):118\u2013125. doi: 10.1002\/jgf2.15 Mycoplasma pneumoniae infection: Basics Takeshi Saraya 1,\u2709 PMCID: PMC5689399\u00a0\u00a0PMID: 29264006 Abstract Mycoplasma pneumoniae (Mp) is one of the leading causes of community\u2010acquired pneumonia and can cause a number of extrapulmonary manifestations in the absence of pneumonia. 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