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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Immunohistochemical, in situ hybridization, and ultrastructural localization of SARS-associated coronavirus in lung of a fatal case of severe acute respiratory syndrome in Taiwan</title><author><name sortKey="Shieh, Wun Ju" sort="Shieh, Wun Ju" uniqKey="Shieh W" first="Wun-Ju" last="Shieh">Wun-Ju Shieh</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Hsiao, Cheng Hsiang" sort="Hsiao, Cheng Hsiang" uniqKey="Hsiao C" first="Cheng-Hsiang" last="Hsiao">Cheng-Hsiang Hsiao</name><affiliation><nlm:aff id="aff2">Department of Pathology, National Taiwan University Hospital, Taipei, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Paddock, Christopher D" sort="Paddock, Christopher D" uniqKey="Paddock C" first="Christopher D." last="Paddock">Christopher D. Paddock</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Guarner, Jeannette" sort="Guarner, Jeannette" uniqKey="Guarner J" first="Jeannette" last="Guarner">Jeannette Guarner</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Goldsmith, Cynthia S" sort="Goldsmith, Cynthia S" uniqKey="Goldsmith C" first="Cynthia S." last="Goldsmith">Cynthia S. Goldsmith</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Tatti, Kathleen" sort="Tatti, Kathleen" uniqKey="Tatti K" first="Kathleen" last="Tatti">Kathleen Tatti</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Packard, Michelle" sort="Packard, Michelle" uniqKey="Packard M" first="Michelle" last="Packard">Michelle Packard</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Mueller, Laurie" sort="Mueller, Laurie" uniqKey="Mueller L" first="Laurie" last="Mueller">Laurie Mueller</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Wu, Mu Zong" sort="Wu, Mu Zong" uniqKey="Wu M" first="Mu-Zong" last="Wu">Mu-Zong Wu</name><affiliation><nlm:aff id="aff2">Department of Pathology, National Taiwan University Hospital, Taipei, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Rollin, Pierre" sort="Rollin, Pierre" uniqKey="Rollin P" first="Pierre" last="Rollin">Pierre Rollin</name><affiliation><nlm:aff id="aff3">Special Pathogens Branch, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA</nlm:aff></affiliation></author><author><name sortKey="Su, Ih Jen" sort="Su, Ih Jen" uniqKey="Su I" first="Ih-Jen" last="Su">Ih-Jen Su</name><affiliation><nlm:aff id="aff4">Center for Disease Control, Taiwan, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Zaki, Sherif R" sort="Zaki, Sherif R" uniqKey="Zaki S" first="Sherif R." last="Zaki">Sherif R. Zaki</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">15791576</idno><idno type="pmc">7112064</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7112064</idno><idno type="RBID">PMC:7112064</idno><idno type="doi">10.1016/j.humpath.2004.11.006</idno><date when="2005">2005</date><idno type="wicri:Area/Pmc/Corpus">000882</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000882</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Immunohistochemical, in situ hybridization, and ultrastructural localization of SARS-associated coronavirus in lung of a fatal case of severe acute respiratory syndrome in Taiwan</title><author><name sortKey="Shieh, Wun Ju" sort="Shieh, Wun Ju" uniqKey="Shieh W" first="Wun-Ju" last="Shieh">Wun-Ju Shieh</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Hsiao, Cheng Hsiang" sort="Hsiao, Cheng Hsiang" uniqKey="Hsiao C" first="Cheng-Hsiang" last="Hsiao">Cheng-Hsiang Hsiao</name><affiliation><nlm:aff id="aff2">Department of Pathology, National Taiwan University Hospital, Taipei, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Paddock, Christopher D" sort="Paddock, Christopher D" uniqKey="Paddock C" first="Christopher D." last="Paddock">Christopher D. Paddock</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Guarner, Jeannette" sort="Guarner, Jeannette" uniqKey="Guarner J" first="Jeannette" last="Guarner">Jeannette Guarner</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Goldsmith, Cynthia S" sort="Goldsmith, Cynthia S" uniqKey="Goldsmith C" first="Cynthia S." last="Goldsmith">Cynthia S. Goldsmith</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Tatti, Kathleen" sort="Tatti, Kathleen" uniqKey="Tatti K" first="Kathleen" last="Tatti">Kathleen Tatti</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Packard, Michelle" sort="Packard, Michelle" uniqKey="Packard M" first="Michelle" last="Packard">Michelle Packard</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Mueller, Laurie" sort="Mueller, Laurie" uniqKey="Mueller L" first="Laurie" last="Mueller">Laurie Mueller</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author><author><name sortKey="Wu, Mu Zong" sort="Wu, Mu Zong" uniqKey="Wu M" first="Mu-Zong" last="Wu">Mu-Zong Wu</name><affiliation><nlm:aff id="aff2">Department of Pathology, National Taiwan University Hospital, Taipei, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Rollin, Pierre" sort="Rollin, Pierre" uniqKey="Rollin P" first="Pierre" last="Rollin">Pierre Rollin</name><affiliation><nlm:aff id="aff3">Special Pathogens Branch, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA</nlm:aff></affiliation></author><author><name sortKey="Su, Ih Jen" sort="Su, Ih Jen" uniqKey="Su I" first="Ih-Jen" last="Su">Ih-Jen Su</name><affiliation><nlm:aff id="aff4">Center for Disease Control, Taiwan, Republic of China</nlm:aff></affiliation></author><author><name sortKey="Zaki, Sherif R" sort="Zaki, Sherif R" uniqKey="Zaki S" first="Sherif R." last="Zaki">Sherif R. Zaki</name><affiliation><nlm:aff id="aff1">Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</nlm:aff></affiliation></author></analytic><series><title level="j">Human Pathology</title><idno type="ISSN">0046-8177</idno><idno type="eISSN">1532-8392</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Summary</title><p>This article describes the pathological studies of fatal severe acute respiratory syndrome (SARS) in a 73-year-old man during an outbreak of SARS in Taiwan, 2003. Eight days before onset of symptoms, he visited a municipal hospital that was later identified as the epicenter of a large outbreak of SARS. On admission to National Taiwan University Hospital in Taipei, the patient experienced chest tightness, progressive dyspnea, and low-grade fever. His condition rapidly deteriorated with increasing respiratory difficulty, and he died 7 days after admission. The most prominent histopathologic finding was diffuse alveolar damage of the lung. Immunohistochemical and in situ hybridization assays demonstrated evidence of SARS-associated coronavirus (SARS-CoV) infection in various respiratory epithelial cells, predominantly type II pneumocytes, and in alveolar macrophages in the lung. Electron microscopic examination also revealed coronavirus particles in the pneumocytes, and their identity was confirmed as SARS-CoV by immunogold labeling electron microscopy. This report is the first to describe the cellular localization of SARS-CoV in human lung tissue by using a combination of immunohistochemistry, double-stain immunohistochemistry, in situ hybridization, electron microscopy, and immunogold labeling electron microscopy. These techniques represent valuable laboratory diagnostic modalities and provide insights into the pathogenesis of this emerging infection.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Nicholls, J M" uniqKey="Nicholls J">J.M. Nicholls</name></author><author><name sortKey="Poon, L L" uniqKey="Poon L">L.L. Poon</name></author><author><name sortKey="Lee, K C" uniqKey="Lee K">K.C. Lee</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Franks, T J" uniqKey="Franks T">T.J. Franks</name></author><author><name sortKey="Chong, P Y" uniqKey="Chong P">P.Y. Chong</name></author><author><name sortKey="Chui, P" uniqKey="Chui P">P. Chui</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ksiazek, T G" uniqKey="Ksiazek T">T.G. Ksiazek</name></author><author><name sortKey="Erdman, D" uniqKey="Erdman D">D. Erdman</name></author><author><name sortKey="Goldsmith, C S" uniqKey="Goldsmith C">C.S. Goldsmith</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nakajima, N" uniqKey="Nakajima N">N. Nakajima</name></author><author><name sortKey="Asahi Ozaki, Y" uniqKey="Asahi Ozaki Y">Y. Asahi-Ozaki</name></author><author><name sortKey="Nagata, N" uniqKey="Nagata N">N. Nagata</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kuiken, T" uniqKey="Kuiken T">T. Kuiken</name></author><author><name sortKey="Fouchier, R A" uniqKey="Fouchier R">R.A. Fouchier</name></author><author><name sortKey="Schutten, M" uniqKey="Schutten M">M. Schutten</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chong, P Y" uniqKey="Chong P">P.Y. Chong</name></author><author><name sortKey="Chui, P" uniqKey="Chui P">P. Chui</name></author><author><name sortKey="Ling, A E" uniqKey="Ling A">A.E. Ling</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mcauliffe, J" uniqKey="Mcauliffe J">J. McAuliffe</name></author><author><name sortKey="Vogel, L" uniqKey="Vogel L">L. Vogel</name></author><author><name sortKey="Roberts, A" uniqKey="Roberts A">A. Roberts</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Roberts, A" uniqKey="Roberts A">A. Roberts</name></author><author><name sortKey="Vogel, L" uniqKey="Vogel L">L. Vogel</name></author><author><name sortKey="Guarner, J" uniqKey="Guarner J">J. Guarner</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Haagmans, B L" uniqKey="Haagmans B">B.L. Haagmans</name></author><author><name sortKey="Kuiken, T" uniqKey="Kuiken T">T. Kuiken</name></author><author><name sortKey="Martina, B E" uniqKey="Martina B">B.E. Martina</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="To, K F" uniqKey="To K">K.F. To</name></author><author><name sortKey="Tong, J H" uniqKey="Tong J">J.H. Tong</name></author><author><name sortKey="Chan, P K" uniqKey="Chan P">P.K. Chan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ding, Y" uniqKey="Ding Y">Y. Ding</name></author><author><name sortKey="He, L" uniqKey="He L">L. He</name></author><author><name sortKey="Zhang, Q" uniqKey="Zhang Q">Q. Zhang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Goldsmith, C S" uniqKey="Goldsmith C">C.S. Goldsmith</name></author><author><name sortKey="Tatti, K M" uniqKey="Tatti K">K.M. Tatti</name></author><author><name sortKey="Ksiazek, T G" uniqKey="Ksiazek T">T.G. Ksiazek</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Subbarao, K" uniqKey="Subbarao K">K. Subbarao</name></author><author><name sortKey="Mcauliffe, J" uniqKey="Mcauliffe J">J. McAuliffe</name></author><author><name sortKey="Vogel, L" uniqKey="Vogel L">L. Vogel</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Peiris, J S" uniqKey="Peiris J">J.S. Peiris</name></author><author><name sortKey="Lai, S T" uniqKey="Lai S">S.T. Lai</name></author><author><name sortKey="Poon, L L" uniqKey="Poon L">L.L. Poon</name></author></analytic></biblStruct></listBibl></div1></back></TEI><pmc article-type="brief-report"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Hum Pathol</journal-id><journal-id journal-id-type="iso-abbrev">Hum. Pathol</journal-id><journal-title-group><journal-title>Human Pathology</journal-title></journal-title-group><issn pub-type="ppub">0046-8177</issn><issn pub-type="epub">1532-8392</issn><publisher><publisher-name>Elsevier Inc.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">15791576</article-id><article-id pub-id-type="pmc">7112064</article-id><article-id pub-id-type="publisher-id">S0046-8177(04)00624-0</article-id><article-id pub-id-type="doi">10.1016/j.humpath.2004.11.006</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Immunohistochemical, in situ hybridization, and ultrastructural localization of SARS-associated coronavirus in lung of a fatal case of severe acute respiratory syndrome in Taiwan</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Shieh</surname><given-names>Wun-Ju</given-names></name><degrees>MD, MPH, PhD</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Hsiao</surname><given-names>Cheng-Hsiang</given-names></name><degrees>MD</degrees><xref rid="aff2" ref-type="aff">b</xref></contrib><contrib contrib-type="author"><name><surname>Paddock</surname><given-names>Christopher D.</given-names></name><degrees>MD</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Guarner</surname><given-names>Jeannette</given-names></name><degrees>MD</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Goldsmith</surname><given-names>Cynthia S.</given-names></name><degrees>MS</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Tatti</surname><given-names>Kathleen</given-names></name><degrees>PhD</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Packard</surname><given-names>Michelle</given-names></name><degrees>MPH</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Mueller</surname><given-names>Laurie</given-names></name><degrees>BA, BS</degrees><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author"><name><surname>Wu</surname><given-names>Mu-Zong</given-names></name><xref rid="aff2" ref-type="aff">b</xref></contrib><contrib contrib-type="author"><name><surname>Rollin</surname><given-names>Pierre</given-names></name><degrees>MD</degrees><xref rid="aff3" ref-type="aff">c</xref></contrib><contrib contrib-type="author"><name><surname>Su</surname><given-names>Ih-Jen</given-names></name><degrees>MD, PhD</degrees><xref rid="aff4" ref-type="aff">d</xref></contrib><contrib contrib-type="author"><name><surname>Zaki</surname><given-names>Sherif R.</given-names></name><degrees>MD, PhD</degrees><email>sZaki@cdc.gov</email><xref rid="aff1" ref-type="aff">a</xref><xref rid="cor1" ref-type="corresp">*</xref></contrib></contrib-group><aff id="aff1"><label>a</label>Infectious Disease Pathology Activity, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA</aff><aff id="aff2"><label>b</label>Department of Pathology, National Taiwan University Hospital, Taipei, Republic of China</aff><aff id="aff3"><label>c</label>Special Pathogens Branch, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA</aff><aff id="aff4"><label>d</label>Center for Disease Control, Taiwan, Republic of China</aff><author-notes><corresp id="cor1"><label>*</label>Corresponding author. <email>sZaki@cdc.gov</email></corresp></author-notes><pub-date pub-type="pmc-release"><day>3</day><month>3</month><year>2005</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="ppub"><month>3</month><year>2005</year></pub-date><pub-date pub-type="epub"><day>3</day><month>3</month><year>2005</year></pub-date><volume>36</volume><issue>3</issue><fpage>303</fpage><lpage>309</lpage><history><date date-type="received"><day>8</day><month>9</month><year>2004</year></date><date date-type="accepted"><day>29</day><month>10</month><year>2004</year></date></history><permissions><copyright-statement>Copyright © 2005 Elsevier Inc. All rights reserved.</copyright-statement><copyright-year>2005</copyright-year><copyright-holder>Elsevier Inc.</copyright-holder><license><license-p>Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.</license-p></license></permissions><abstract><title>Summary</title><p>This article describes the pathological studies of fatal severe acute respiratory syndrome (SARS) in a 73-year-old man during an outbreak of SARS in Taiwan, 2003. Eight days before onset of symptoms, he visited a municipal hospital that was later identified as the epicenter of a large outbreak of SARS. On admission to National Taiwan University Hospital in Taipei, the patient experienced chest tightness, progressive dyspnea, and low-grade fever. His condition rapidly deteriorated with increasing respiratory difficulty, and he died 7 days after admission. The most prominent histopathologic finding was diffuse alveolar damage of the lung. Immunohistochemical and in situ hybridization assays demonstrated evidence of SARS-associated coronavirus (SARS-CoV) infection in various respiratory epithelial cells, predominantly type II pneumocytes, and in alveolar macrophages in the lung. Electron microscopic examination also revealed coronavirus particles in the pneumocytes, and their identity was confirmed as SARS-CoV by immunogold labeling electron microscopy. This report is the first to describe the cellular localization of SARS-CoV in human lung tissue by using a combination of immunohistochemistry, double-stain immunohistochemistry, in situ hybridization, electron microscopy, and immunogold labeling electron microscopy. These techniques represent valuable laboratory diagnostic modalities and provide insights into the pathogenesis of this emerging infection.</p></abstract><kwd-group><title>Keywords</title><kwd>SARS</kwd><kwd>Coronavirus</kwd><kwd>Diffuse alveolar damage</kwd><kwd>Immunohistochemistry</kwd><kwd>In situ hybridization</kwd><kwd>Electron microscopy</kwd><kwd>Immunogold labeling electron microscopy</kwd></kwd-group></article-meta></front><body><sec><label>1</label><title>Introduction</title><p>Severe acute respiratory syndrome (SARS) is an emergent respiratory viral disease that was first reported in Asia during February 2003 and quickly spread to many countries in North and South America, Europe, and Asia. Through December 2003, this global epidemic had resulted in 8098 reported probable cases, of which 774 were fatal <xref rid="bib1" ref-type="bibr">[1]</xref>. Various reports have described diffuse alveolar damage as the main histopathologic finding in patients with SARS <xref rid="bib2" ref-type="bibr">[2]</xref>, <xref rid="bib3" ref-type="bibr">[3]</xref>, <xref rid="bib4" ref-type="bibr">[4]</xref>, and SARS-associated coronavirus (SARS-CoV) has been demonstrated in human and experimental animal tissues by immunohistochemical or in situ hybridization (ISH) assays <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib8" ref-type="bibr">[8]</xref>, <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib10" ref-type="bibr">[10]</xref>, <xref rid="bib11" ref-type="bibr">[11]</xref>, <xref rid="bib12" ref-type="bibr">[12]</xref>. Coronavirus-like particles have been detected by electron microscopy (EM) in cells from a bronchoalveolar lavage specimen <xref rid="bib4" ref-type="bibr">[4]</xref>, <xref rid="bib13" ref-type="bibr">[13]</xref> and in pneumocytes from postmortem lung samples <xref rid="bib2" ref-type="bibr">[2]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>. Because coronavirus particles may be confused morphologically with other nonviral cellular components, a specific technique, such as immunogold labeling EM (IEM), is needed to definitively characterize SARS-CoV particles. We describe the use of immunohistochemistry (IHC), ISH, EM, and IEM for the pathological diagnosis of SARS and cellular localization of SARS-CoV. We also discuss the use of these techniques to investigate the pathogenesis of this emerging infection.</p></sec><sec><label>2</label><title>Case report</title><p>This 73-year-old male patient sought medical treatment at the emergency service at National Taiwan University Hospital (NTUH) in Taipei, Taiwan, on April 23, 2003, because of recurrent dyspnea and orthopnea. His past medical history included 3 years of type 2 diabetes mellitus, a myocardial infarct 2 years earlier, and 2 recent admissions to NTUH due to acute coronary syndrome and congestive heart failure.</p><p>On arrival at emergency service, the patient was afebrile and initial physical examination revealed a temperature of 37°C, heart rate of 112 beats per minute, and respiration rate of 24/min. Chest x-ray showed mild pulmonary congestion. The temperature elevated to 37.9°C 2 hours later, and urinalysis showed 20 to 30 white blood cells. A presumptive diagnosis of urinary tract infection and congestive heart failure was made, and the patient was treated with antibiotics, diuretics, and intravenous nitroglycerin. The patient was admitted to a cardiology ward 2 days later and became increasingly dyspneic with a nonproductive cough and persistent low-grade fever. Serial chest x-rays showed progressive lung infiltrates. A more detailed history revealed that the patient had visited Taipei Hoping City Hospital on April 15 and 16. Because this hospital was associated with a large nosocomial outbreak of SARS during late April, the patient was immediately isolated as a probable SARS case. Throat and nasopharyngeal swabs were positive for SARS-CoV by viral isolation and polymerase chain reaction (PCR) assay. He was transferred to an intensive care unit on April 29 after sudden onset of mental status changes, hypotension, and melena. The patient subsequently developed ventricular fibrillation and died 1 day later.</p></sec><sec><label>3</label><title>Materials and methods</title><p>Lung tissues obtained from a limited autopsy were fixed in 10% buffered formalin and paraffin embedded. Tissue sections were stained by routine hematoxylin and eosin for histopathologic evaluation.</p><p>Immunohistochemistry was performed as previously described <xref rid="bib14" ref-type="bibr">[14]</xref> by using a colorimetric indirect immunoalkaline phosphatase method with a hyperimmune mouse anti–SARS-CoV ascitic fluid. Negative controls included Vero E6 cells infected with human coronavirus OC43, Vero E6 cells infected with human coronavirus 229E, noninfected Vero cells, and tissues from non-SARS cases. Normal mouse antiserum was used as a negative control antibody. Double-stain IHC was performed by using peroxidase polymer (DAKO, Carpinteria, CA)–labeled antibodies against cytokeratin, surfactant, or CD68 (DAKO), followed by the mouse anti–SARS-CoV antibody labeled with immunoalkaline phosphatase polymer.</p><p>A colorimetric ISH was performed as previously described <xref rid="bib14" ref-type="bibr">[14]</xref>. Briefly, negative-sense digoxin-labeled riboprobes were generated from PCR products amplified from the nucleocapsid (N) (625 bases in length) or polymerase (Pol) (325 bases in length) regions of the SARS-CoV genome and tailed with the T7 promoter. Tissue sections were incubated with a pool of N and Pol probes.</p><p>Specimens for EM were excised from paraffin-embedded blocks of lung in areas corresponding to positive IHC and ISH results. Tissues were deparaffinized in xylene and embedded for EM as previously described <xref rid="bib13" ref-type="bibr">[13]</xref>. Immunogold labeling assays used the same mouse anti–SARS-CoV antibody as IHC experiments, and the antibody was detected by using goat antimouse conjugated to 12-nm colloidal gold.</p></sec><sec><label>4</label><title>Results</title><sec><label>4.1</label><title>Histopathology</title><p>The lungs showed features characteristic of the proliferative phase of diffuse alveolar damage, with desquamation of epithelial cells, fibrin deposits in the alveolar spaces, hyperplasia of type II pneumocytes, and increased mononuclear inflammatory cell infiltrates in the interstitium (<xref rid="fig1" ref-type="fig">Fig. 1</xref>A). No multinucleated syncytial cells were observed.<fig id="fig1"><label>Fig. 1</label><caption><p>A, Histopathology of lung from SARS patient showed diffuse alveolar damage, characterized by desquamation of epithelial cells, fibrin deposits in the alveolar space, hyperplasia of type II pneumocytes, and increased mononuclear infiltrate in the interstitium (hematoxylin and eosin stain). B and C, SARS-CoV antigens in pneumocytes (immunoalkaline phosphatase with naphthol fast-red substrate and hematoxylin counterstain). D and E, SARS-CoV nucleic acids in pneumocytes (ISH with naphthol fast-red substrate and hematoxylin counterstain). F and H, SARS-CoV–infected interstitial cell, with viral nucleocapsid inclusion bodies (arrows) and virions in cellular vesicles (arrowhead). G, SARS-CoV antigens were detected within the cytoplasmic inclusions (immunogold labeling with 12-nm colloidal gold). Bar size indicated in micrometers and nanometers.</p></caption><graphic xlink:href="gr1"></graphic></fig></p></sec><sec><label>4.2</label><title>Immunohistochemistry</title><p>SARS-CoV antigens were abundant and distributed multifocally in the lung. Viral antigens were seen predominantly in the cytoplasm of pneumocytes (<xref rid="fig1" ref-type="fig">Fig. 1</xref>B and C), occasionally in macrophages, and in association with intraalveolar necrotic debris. Double staining revealed that most infected cells were pneumocytes (colabeled with cytokeratin, <xref rid="fig2" ref-type="fig">Fig. 2</xref>A), predominantly type II pneumocytes (colabeled with surfactant, <xref rid="fig2" ref-type="fig">Fig. 2</xref>B), and less frequently macrophages (colabeled with CD68, <xref rid="fig3" ref-type="fig">Fig. 3</xref>A). Negative controls did not show staining by IHC with anti–SARS-CoV antibody. Normal mouse antiserum did not show any staining on SARS-CoV–infected Vero cells and lung tissues of this case.<fig id="fig2"><label>Fig. 2</label><caption><p>A, SARS-CoV and cytokeratin antigens in pneumocytes. Red stain, SARS-CoV; brown stain, cytokeratin (double-stain IHC immunoalkaline phosphatase polymer and with peroxidase polymer). B, SARS-CoV and surfactant antigens in type II pneumocytes. Red stain, SARS-CoV; brown stain, surfactant (double-stain IHC with immunoalkaline phosphatase polymer and peroxidase polymer). C, Numerous virions (arrows) are seen within the cytoplasmic vesicles of this pneumocyte, overlying the basement membrane and another pneumocyte. D, SARS-CoV particles, averaging 51 nm in these deparaffinized tissues, are seen in a cytoplasmic vesicle of an infected pneumocyte. Virions are composed of a helical nucleocapsid, often seen in cross section, surrounded by a viral envelope. Bar size indicated in micrometers and nanometers.</p></caption><graphic xlink:href="gr2"></graphic></fig><fig id="fig3"><label>Fig. 3</label><caption><p>A, SARS-CoV and CD68 antigens in alveolar macrophage. Red stain, SARS-CoV; brown stain, CD68 (double-stain IHC with immunoalkaline phosphatase and peroxidase polymer). B, SARS-CoV antigens in intraalveolar necrotic debris. C and D, Extracellular virions were often associated with fibrin within the alveolar space. C inset, Higher magnification of area at arrow. Bar size indicated in micrometers or nanometers.</p></caption><graphic xlink:href="gr3"></graphic></fig></p></sec><sec><label>4.3</label><title>In situ hybridization</title><p>Viral nucleic acids were detected by ISH with a distribution similar to that identified by using IHC, mainly in pneumocytes and some macrophages (<xref rid="fig1" ref-type="fig">Fig. 1</xref>D and E). All pertinent positive and negative controls were run in parallel with comparable results described for IHC.</p></sec><sec><label>4.4</label><title>Electron microscopy</title><p>Electron microscopy examination of lung tissues that had been selected from areas with abundant IHC staining showed numerous viral particles and nucleocapsid inclusions typical of the family Coronaviridae. Virions were predominantly seen in cytoplasmic vesicles (<xref rid="fig1" ref-type="fig">Figs. 1</xref>F, H and <xref rid="fig2" ref-type="fig">2</xref>C, D) and along the cell membranes of pneumocytes, which were attached to the basement membrane or free in the alveolar space, in phagosomes of macrophages (<xref rid="fig3" ref-type="fig">Fig. 3</xref>C and inset), and associated with fibrin in alveolar spaces (<xref rid="fig3" ref-type="fig">Fig. 3</xref>D). Some infected cells also had prominent coronavirus nucleocapsid inclusions (<xref rid="fig1" ref-type="fig">Fig. 1</xref>F and H). The viral nature of the observed particles and cytoplasmic inclusions was confirmed by IEM labeling (<xref rid="fig1" ref-type="fig">Fig. 1</xref>G).</p></sec></sec><sec><label>5</label><title>Discussion</title><p>In this report, we describe the localization of SARS-CoV in various cellular and extracellular locations in the lung of a patient who died of SARS. Previous studies have demonstrated the cellular tropism of SARS-CoV in the tissues of patients by using ISH <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib11" ref-type="bibr">[11]</xref>, <xref rid="bib12" ref-type="bibr">[12]</xref> or EM <xref rid="bib2" ref-type="bibr">[2]</xref>, <xref rid="bib4" ref-type="bibr">[4]</xref>, <xref rid="bib13" ref-type="bibr">[13]</xref>, <xref rid="bib15" ref-type="bibr">[15]</xref>. Immunohistochemical has also been used to localize viral antigens in the human tissues <xref rid="bib12" ref-type="bibr">[12]</xref> and tissues of animals experimentally infected with SARS-CoV <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib8" ref-type="bibr">[8]</xref>, <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib10" ref-type="bibr">[10]</xref>. To our knowledge, this is the first report to localize SARS-CoV in human tissues by using IEM and double-stain IHC. In an earlier study of 4 human cases <xref rid="bib4" ref-type="bibr">[4]</xref>, we were not able to demonstrate viral antigens in the lung by IHC. The most likely explanation is that all tissue samples from patients in that study were obtained after a clinical course lasting longer than 14 days. In a recent report by Chong et al <xref rid="bib7" ref-type="bibr">[7]</xref>, a similar observation was documented with the inability of ISH to detect viral nucleic acids in patients who died beyond 8 days. The patient in this case report died 7 days after onset of symptoms, and coronavirus antigens and RNA could be detected by IHC and ISH. Electron microscopy also identified viral particles in the lung tissue, and the viral nature of these particles was confirmed by IEM. More cases are needed to further characterize the temporal relationship between the duration of illness and viral clearance in human lung tissue.</p><p>The development of a specific IHC, ISH, and IEM to identify SARS-CoV in formalin-fixed, paraffin-embedded samples also allowed us to assess the cellular tropism of SARS-CoV infection in human lung tissues. SARS-CoV antigens were localized primarily in the cytoplasm of type II pneumocytes, and occasionally in alveolar macrophages. Type II pneumocytes are known to secrete pulmonary surfactant, which reduces surface tension and preserves the integrity of the alveolar space. These cells also play an important role in tissue restitution after lung damage. There is also mounting evidence to support their contribution to the development of acute inflammatory lung injury after exposure to biological or chemical agents. Type II pneumocytes can be directly infected by bacteria or viruses and modulate the corresponding pathogenesis of these organisms. Additional studies are needed to further define the role of type II pneumocytes and alveolar macrophages in SARS-CoV infection. Haagmans et al <xref rid="bib10" ref-type="bibr">[10]</xref> showed extensive SARS-CoV antigen expression in experimentally infected cynomolgus macaques at day 4 postinfection. The antigens were mainly in alveolar lining epithelial cells with morphologic characteristics of type I pneumocytes, suggesting that type I pneumocytes are the primary targets for SARS-CoV infection early in the disease. In a recent study using a nonhuman primate model <xref rid="bib8" ref-type="bibr">[8]</xref>, we examined the lung tissues of day 2 postinfection monkeys and demonstrated that type I pneumocytes were the main type of cells involved at this early stage, whereas only some type II pneumocytes were involved. Type I pneumocytes normally represent 90% of the alveolar epithelial cell volume and are easily damaged during pulmonary infections or other types of injury. Type II pneumocytes are more resistant to damage, and this feature is important for the repair process because these cells produce surfactant, proliferate, and differentiate into type I cells during lung damage. Collectively, these data indicate that SARS-CoV infects both type I and II pneumocytes, and clearance and localization of the virus may depend on the stage of illness as well as individual immunologic responses. Other target cells for SARS-CoV infection, such as bronchiolar epithelial cells <xref rid="bib14" ref-type="bibr">[14]</xref>, may also have a significant role in virus replication and transmission.</p><p>The emergence of SARS-CoV has posed a major threat to global health. A specific etiologic diagnosis is particularly important during SARS-CoV disease outbreaks because of the impact on hospital infection control and other public health measures. Because the clinical features of SARS-CoV infection can be similar to those of many other respiratory infections, a definitive diagnosis can be made only by laboratory confirmation. Laboratory assays currently used for SARS diagnosis include virus isolation, PCR, and serology. Pathology-based methods, such as IHC, ISH, EM, and IEM, offer the advantage of interpreting the test results within a morphologic context and can also be used for diagnosis if appropriate tissue specimens are available. Despite the limited tissue samples in this single case report, we were able to successfully use specific IHC, ISH, and IEM methods for SARS-CoV detection in human lung tissue. These methods should help enhance the pathological diagnosis and further our understanding of the pathogenesis of SARS-CoV infection.</p></sec></body><back><ref-list><title>References</title><ref id="bib1"><label>1</label><element-citation publication-type="journal"><article-title>WHO issues consensus document on the epidemiology of SARS</article-title><source>Wkly. Epidemiol. 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