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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Coronavirus disease 2019 (COVID-19): current status and future perspectives</title><author><name sortKey="Li, Heng" sort="Li, Heng" uniqKey="Li H" first="Heng" last="Li">Heng Li</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Liu, Shang Ming" sort="Liu, Shang Ming" uniqKey="Liu S" first="Shang-Ming" last="Liu">Shang-Ming Liu</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Yu, Xiao Hua" sort="Yu, Xiao Hua" uniqKey="Yu X" first="Xiao-Hua" last="Yu">Xiao-Hua Yu</name><affiliation><nlm:aff id="aff0002">Institute of Clinical Medicine, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 460106, China</nlm:aff></affiliation></author><author><name sortKey="Tang, Shi Lin" sort="Tang, Shi Lin" uniqKey="Tang S" first="Shi-Lin" last="Tang">Shi-Lin Tang</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Tang, Chao Ke" sort="Tang, Chao Ke" uniqKey="Tang C" first="Chao-Ke" last="Tang">Chao-Ke Tang</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">32234466</idno><idno type="pmc">7139247</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7139247</idno><idno type="RBID">PMC:7139247</idno><idno type="doi">10.1016/j.ijantimicag.2020.105951</idno><date when="2020">2020</date><idno type="wicri:Area/Pmc/Corpus">001068</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001068</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Coronavirus disease 2019 (COVID-19): current status and future perspectives</title><author><name sortKey="Li, Heng" sort="Li, Heng" uniqKey="Li H" first="Heng" last="Li">Heng Li</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Liu, Shang Ming" sort="Liu, Shang Ming" uniqKey="Liu S" first="Shang-Ming" last="Liu">Shang-Ming Liu</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Yu, Xiao Hua" sort="Yu, Xiao Hua" uniqKey="Yu X" first="Xiao-Hua" last="Yu">Xiao-Hua Yu</name><affiliation><nlm:aff id="aff0002">Institute of Clinical Medicine, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 460106, China</nlm:aff></affiliation></author><author><name sortKey="Tang, Shi Lin" sort="Tang, Shi Lin" uniqKey="Tang S" first="Shi-Lin" last="Tang">Shi-Lin Tang</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author><author><name sortKey="Tang, Chao Ke" sort="Tang, Chao Ke" uniqKey="Tang C" first="Chao-Ke" last="Tang">Chao-Ke Tang</name><affiliation><nlm:aff id="aff0001">Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</nlm:aff></affiliation></author></analytic><series><title level="j">International Journal of Antimicrobial Agents</title><idno type="ISSN">0924-8579</idno><idno type="eISSN">1872-7913</idno><imprint><date when="2020">2020</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Highlights</title><p><list list-type="simple" id="celist0001"><list-item id="celistitem0001"><label>•</label><p id="para0002">As of 3 March 2020, COVID-19 has spread rapidly in 46 countries, causing >90 000 confirmed cases and >2946 deaths.</p></list-item><list-item id="celistitem0002"><label>•</label><p id="para0003">Detection methods for SARS-CoV-2 include RT-qPCR and SHERLOCK technique.</p></list-item><list-item id="celistitem0003"><label>•</label><p id="para0004">Four structural proteins are essential for SARS-CoV-2 assembly and infection, comprising the S, M, E and N proteins.</p></list-item><list-item id="celistitem0004"><label>•</label><p id="para0005">Pangolin may be a potential intermediate host for SARS-CoV-2.</p></list-item><list-item id="celistitem0005"><label>•</label><p id="para0006">Antiviral therapy, cellular therapy, immunotherapy and Chinese medicine may be promising therapeutic strategies.</p></list-item></list></p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Banerjee, A" uniqKey="Banerjee A">A Banerjee</name></author><author><name sortKey="Kulcsar, K" uniqKey="Kulcsar K">K Kulcsar</name></author><author><name sortKey="Misra, V" uniqKey="Misra V">V Misra</name></author><author><name sortKey="Frieman, M" uniqKey="Frieman M">M Frieman</name></author><author><name sortKey="Mossman, K" uniqKey="Mossman K">K Mossman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Yang, D" uniqKey="Yang D">D 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Int J Antimicrob Agents</journal-id><journal-id journal-id-type="iso-abbrev">Int. J. Antimicrob. Agents</journal-id><journal-title-group><journal-title>International Journal of Antimicrobial Agents</journal-title></journal-title-group><issn pub-type="ppub">0924-8579</issn><issn pub-type="epub">1872-7913</issn><publisher><publisher-name>Elsevier B.V. and International Society of Chemotherapy.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">32234466</article-id><article-id pub-id-type="pmc">7139247</article-id><article-id pub-id-type="publisher-id">S0924-8579(20)30101-1</article-id><article-id pub-id-type="doi">10.1016/j.ijantimicag.2020.105951</article-id><article-id pub-id-type="publisher-id">105951</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Coronavirus disease 2019 (COVID-19): current status and future perspectives</article-title></title-group><contrib-group><contrib contrib-type="author" id="au0001"><name><surname>Li</surname><given-names>Heng</given-names></name><xref rid="aff0001" ref-type="aff">a</xref><xref rid="fn1" ref-type="fn">1</xref></contrib><contrib contrib-type="author" id="au0002"><name><surname>Liu</surname><given-names>Shang-Ming</given-names></name><xref rid="aff0001" ref-type="aff">a</xref><xref rid="fn1" ref-type="fn">1</xref></contrib><contrib contrib-type="author" id="au0003"><name><surname>Yu</surname><given-names>Xiao-Hua</given-names></name><xref rid="aff0002" ref-type="aff">b</xref><xref rid="fn1" ref-type="fn">1</xref></contrib><contrib contrib-type="author" id="au0004"><name><surname>Tang</surname><given-names>Shi-Lin</given-names></name><email>286756823@qq.com</email><xref rid="aff0001" ref-type="aff">a</xref><xref rid="cor0002" ref-type="corresp">⁎⁎</xref></contrib><contrib contrib-type="author" id="au0005"><name><surname>Tang</surname><given-names>Chao-Ke</given-names></name><email>tangchaoke@qq.com</email><xref rid="aff0001" ref-type="aff">a</xref><xref rid="cor0001" ref-type="corresp">⁎</xref></contrib></contrib-group><aff id="aff0001"><label>a</label>Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Medical Research Experiment Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, University of South China, Hengyang, Hunan 421001, China</aff><aff id="aff0002"><label>b</label>Institute of Clinical Medicine, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 460106, China</aff><author-notes><corresp id="cor0001"><label>⁎</label>Corresponding authors. Present addresses: Institute of Cardiovascular Disease, University of South China, Hengyang, Hunan 421001, China. <email>tangchaoke@qq.com</email></corresp><corresp id="cor0002"><label>⁎⁎</label>Department of Intensive Care Unit, the First Affiliated Hospital of University of South China, Hengyang, Hunan 421001, China. <email>286756823@qq.com</email></corresp><fn id="fn1"><label>1</label><p id="notep0001">These three authors contributed equally to this work.</p></fn></author-notes><pub-date pub-type="pmc-release"><day>29</day><month>3</month><year>2020</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="epub"><day>29</day><month>3</month><year>2020</year></pub-date><elocation-id>105951</elocation-id><history><date date-type="received"><day>6</day><month>3</month><year>2020</year></date><date date-type="accepted"><day>19</day><month>3</month><year>2020</year></date></history><permissions><copyright-statement>© 2020 Elsevier B.V. and International Society of Chemotherapy. All rights reserved.</copyright-statement><copyright-year>2020</copyright-year><copyright-holder>Elsevier Ltd</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 abstract-type="author-highlights" id="abs0001"><title>Highlights</title><p><list list-type="simple" id="celist0001"><list-item id="celistitem0001"><label>•</label><p id="para0002">As of 3 March 2020, COVID-19 has spread rapidly in 46 countries, causing >90 000 confirmed cases and >2946 deaths.</p></list-item><list-item id="celistitem0002"><label>•</label><p id="para0003">Detection methods for SARS-CoV-2 include RT-qPCR and SHERLOCK technique.</p></list-item><list-item id="celistitem0003"><label>•</label><p id="para0004">Four structural proteins are essential for SARS-CoV-2 assembly and infection, comprising the S, M, E and N proteins.</p></list-item><list-item id="celistitem0004"><label>•</label><p id="para0005">Pangolin may be a potential intermediate host for SARS-CoV-2.</p></list-item><list-item id="celistitem0005"><label>•</label><p id="para0006">Antiviral therapy, cellular therapy, immunotherapy and Chinese medicine may be promising therapeutic strategies.</p></list-item></list></p></abstract><abstract id="abs0002"><p>Coronavirus disease 2019 (COVID-19) originated in the city of Wuhan, Hubei Province, Central China, and has spread quickly to 72 countries to date. COVID-19 is caused by a novel coronavirus, named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) [previously provisionally known as 2019 novel coronavirus (2019-nCoV)]. At present, the newly identified SARS-CoV-2 has caused a large number of deaths with tens of thousands of confirmed cases worldwide, posing a serious threat to public health. However, there are no clinically approved vaccines or specific therapeutic drugs available for COVID-19. Intensive research on the newly emerged SARS-CoV-2 is urgently needed to elucidate the pathogenic mechanisms and epidemiological characteristics and to identify potential drug targets, which will contribute to the development of effective prevention and treatment strategies. Hence, this review will focus on recent progress regarding the structure of SARS-CoV-2 and the characteristics of COVID-19, such as the aetiology, pathogenesis and epidemiological characteristics.</p></abstract><kwd-group id="keys0001"><title>Keywords</title><kwd>COVID-19</kwd><kwd>SARS-CoV-2</kwd><kwd>2019-nCoV</kwd><kwd>Coronavirus</kwd><kwd>Pneumonia</kwd></kwd-group></article-meta><notes><p id="misc0001">Editor: Jean-Marc Rolain</p></notes></front><body><sec id="sec0001"><label>1</label><title>Introduction</title><p id="para0007">Coronaviruses (CoVs) belong to the subfamily Orthocoronavirinae in the family Coronaviridae, Order Nidovirales. There are four genera within the subfamily Orthocoronavirinae, namely Alphacoronavirus (α-CoV), Betacoronavirus (β-CoV), Gammacoronavirus (γ-CoV) and Deltacoronavirus (δ-CoV) <xref rid="bib0001" ref-type="bibr">[1</xref>,<xref rid="bib0002" ref-type="bibr">2]</xref>. The CoV genome is an enveloped, positive-sense, single-stranded RNA with a size varying between 26 kb and 32 kb, the largest genome of known RNA viruses. Both α- and β-CoV genera are known to infect mammals, whilst δ- and γ-CoVs infect birds. Two recent outbreaks of viral pneumonia caused by β-CoVs are severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). In 2002, an outbreak of SARS was first reported in China and then spread quickly worldwide, resulting in hundreds of deaths with an 11% mortality rate <xref rid="bib0003" ref-type="bibr">[3</xref>,<xref rid="bib0004" ref-type="bibr">4]</xref>. In 2012, MERS first emerged in Saudi Arabia and subsequently spread to other countries, with a fatality rate of 37% <xref rid="bib0005" ref-type="bibr">[5]</xref>, <xref rid="bib0006" ref-type="bibr">[6]</xref>, <xref rid="bib0007" ref-type="bibr">[7]</xref>. In both of these epidemics, the viruses likely originated from bats and then infected humans through other intermediate animal hosts, e.g. the civet (<italic>Paguma larvata</italic>) for SARS-CoV and the camel for MERS-CoV <xref rid="bib0008" ref-type="bibr">[8]</xref>, <xref rid="bib0009" ref-type="bibr">[9]</xref>, <xref rid="bib0010" ref-type="bibr">[10]</xref>.</p><p id="para0008">Beginning in December 2019, a number of patients with pneumonia of unknown aetiology emerged in Wuhan City, Hubei Province, Central China. Genome sequencing has demonstrated that this pneumonia, named coronavirus disease 2019 (COVID-19), is caused by a novel CoV, namely severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), previously known as 2019 novel coronavirus (2019-nCoV) <xref rid="bib0011" ref-type="bibr">[11]</xref>, <xref rid="bib0012" ref-type="bibr">[12]</xref>, <xref rid="bib0013" ref-type="bibr">[13]</xref>. Like SARS-CoV and MERS-CoV, this newly emerged SARS-CoV-2 virus belongs to the B lineage of the β-CoVs.</p><p id="para0009">To date, COVID-19 has spread rapidly in 72 countries, causing >90 000 confirmed cases and over 2946 deaths as of 3 March 2020. Considering the global threat, the World Health Organization (WHO) has declared COVID-19 a public health emergency of international concern (PHEIC). However, there are no vaccines against SARS-CoV-2 or specific therapeutic drugs for this communicable disease. Thus, a better understanding of SARS-CoV-2 is essential for exploring effective vaccines and drugs. In this review, we summarise recent progress in SARS-CoV-2 to provide a framework for the prevention and treatment of COVID-19.</p></sec><sec id="sec0002"><label>2</label><title>Structure of SARS-CoV-2</title><p id="para0010">The SARS-CoV-2 genome (30 kb in size) encodes a large, non-structural polyprotein (ORF1a/b) that is further proteolytically cleaved to generate 15/16 proteins, 4 structural proteins and 5 accessory proteins (ORF3a, ORF6, ORF7, ORF8 and ORF9) <xref rid="bib0014" ref-type="bibr">[14]</xref>, <xref rid="bib0015" ref-type="bibr">[15]</xref>, <xref rid="bib0016" ref-type="bibr">[16]</xref> (<xref rid="fig0001" ref-type="fig">Fig. 1</xref>). The four structural proteins consist of the spike (S) surface glycoprotein, the membrane (M) protein, the envelope (E) protein and the nucleocapsid (N) protein, which are essential for SARS-CoV-2 assembly and infection. The spike surface glycoprotein plays a key role in its attachment to host cells and can be further cleaved by host proteases into an N-terminal S1 subunit and a membrane-bound C-terminal S2 region <xref rid="bib0017" ref-type="bibr">[17]</xref>. Binding of the S1 subunit to a host receptor can destabilise the prefusion trimer, leading to shedding of the S1 subunit and transition of the S2 subunit into a highly stable postfusion conformation <xref rid="bib0018" ref-type="bibr">[18]</xref>. In order to engage a host receptor, the receptor-binding domain (RBD) of the S1 subunit undergoes hinge-like conformational movements, which transiently hide or expose the determinants of receptor binding <xref rid="bib0019" ref-type="bibr">[19</xref>,<xref rid="bib0020" ref-type="bibr">20]</xref>. These two states of the S1 subunit can be regarded as the ‘down’ conformation and the ‘up’ conformation. The former represents an inaccessible state of the receptor, whereas the latter corresponds to an accessible state <xref rid="bib0019" ref-type="bibr">[19</xref>,<xref rid="bib0021" ref-type="bibr">21]</xref>. Therefore, understanding the structure and function of the spike protein can help to develop monoclonal antibody drugs and to guide the design and development of vaccines.<fig id="fig0001"><label>Fig. 1</label><caption><p>Structure and genome of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). (A) There are four structural proteins as follows: spike (S) surface glycoprotein (purple); membrane (M) protein (orange); nucleocapsid (N) protein (blue); and envelope (E) protein (green). Genomic RNA is shown encased in the N protein. (B) The SARS-CoV-2 genome is arranged in the order of 5′-replicase (ORF1a/b)–structural proteins [spike (S)–envelope (E)–membrane (M)–nucleocapsid (N)]−3′.</p></caption><alt-text id="alt0001">Fig 1</alt-text><graphic xlink:href="gr1_lrg"></graphic></fig></p></sec><sec id="sec0003"><label>3</label><title>Etiology and pathogenesis of COVID-19</title><p id="para0011">SARS-CoV-2 is the seventh member of the family of CoVs that infect humans. Four human CoVs (HCoV-229E, HCoV-NL63, HCoV-OC43 and HCoV-HKU1) are able to cause a wide range of upper respiratory tract infections (common cold), whereas SARS-CoV and MERS-CoV are responsible for atypical pneumonia. The causes of different infection sites are likely related to the presence of dipeptidyl peptidase 4 (DPP4) and angiotensin-converting enzyme 2 (ACE2) in the lower respiratory tract, which are the major human receptors for the surface spike (S) glycoprotein of MERS-CoV and SARS-CoV, respectively <xref rid="bib0022" ref-type="bibr">[22]</xref>, <xref rid="bib0023" ref-type="bibr">[23]</xref>, <xref rid="bib0024" ref-type="bibr">[24]</xref>. The genetic sequence of SARS-CoV-2 is ≥70% similar to that SARS-CoV, and SARS-CoV-2 is capable of using the same cell entry receptor (ACE2) as SARS-CoV to infect humans <xref rid="bib0025" ref-type="bibr">[25</xref>,<xref rid="bib0026" ref-type="bibr">26]</xref>. However, there are more differences in the key S proteins that the viruses use to interact with host cells. SARS-CoV-2 spike binds to human ACE2 with approximately 10–20-fold higher affinity than the SARS-CoV spike <xref rid="bib0019" ref-type="bibr">[19]</xref>, making it easier to spread from human to human.</p><p id="para0012">Upon entry into alveolar epithelial cells, SARS-CoV-2 replicates rapidly and triggers a strong immune response, resulting in cytokine storm syndromes and pulmonary tissue damage. Cytokine storm syndromes, also known as hypercytokinaemia, are a group of disorders characterised by the uncontrolled production of pro-inflammatory cytokines and are important causes of acute respiratory distress syndrome (ARDS) and multiple organ failure <xref rid="bib0027" ref-type="bibr">[27]</xref>, <xref rid="bib0028" ref-type="bibr">[28]</xref>, <xref rid="bib0029" ref-type="bibr">[29]</xref>. Analysis of the first 99 confirmed cases of SARS-CoV-2 infection revealed that cytokine storm syndromes occurred in patients with severe COVID-19; 17 patients (17%) had ARDS, among whom 11 (11%) deteriorated within a short period of time and died of multiple organ failure <xref rid="bib0030" ref-type="bibr">[30]</xref>. In addition, the numbers of total T-cells, CD4<sup>+</sup> T-cells and CD8<sup>+</sup> T-cells are decreased in patients with SARS-CoV-2 infection, and the surviving T-cells are functionally exhausted <xref rid="bib0031" ref-type="bibr">[31]</xref>, suggesting a decreased immune function in SARS-CoV-2-infected patients. ARDS, decreased immune function and secondary infection further worsens respiratory failure.</p></sec><sec id="sec0004"><label>4</label><title>Epidemiological characteristics of SARS-CoV-2</title><sec id="sec0005"><label>4.1</label><title>Progress and current status of the epidemic</title><p id="para0013">Since December 2019, multiple cases of patients with pneumonia of unknown cause were successively reported from the Chinese city of Wuhan. They shared a history of exposure to the Huanan seafood market in Wuhan and the disease was been confirmed to be an acute respiratory infection caused by a novel CoV. To date, the number of patients without a history of exposure to the Huanan seafood market is significantly increased. In addition, some cases without a history of travel to Wuhan have emerged <xref rid="bib0032" ref-type="bibr">[32]</xref>. These early phenomena suggest the possibility of human-to-human transmission.</p><p id="para0014">At present, the National Health Commission of the People's Republic of China has recorded a total of 80 304 confirmed cases of pneumonia with SARS-CoV-2 infection from 34 provinces (districts and cities). These included 6806 serious illnesses and 2946 deaths. By 24:00 on 3 March 2020, 2308 suspected cases were recorded, 664 899 with close contacts to the confirmed patients have been tracked, 7650 people were released from medical observation that day, and 40 651 people were still undergoing medical observation. A total of 137 confirmed cases were reported from Macao Special Administrative Region (SAR) (<italic>n</italic> = 10), Hong Kong SAR (<italic>n</italic> = 93) and Taiwan (Republic of China) (<italic>n</italic> = 34). In addition to China, 46 different countries from Western Pacific Asia, Northern America, Eastern Mediterranean, Southeast Asia, African and Europe have reported confirmed cases of this disease, making a total tally of confirmed cases of 90 870 worldwide.</p></sec><sec id="sec0006"><label>4.2</label><title>Origin of SARS-CoV-2</title><p id="para0015">The initial source of SARS-CoV-2 is still unknown, although the first cases were linked to the Huanan seafood market in Wuhan city. Besides seafood, it is reported on social media that some wild animals including birds, snakes, marmots and bats were sold at the Huanan seafood market. It has been reported that environmental samples obtained from the marketplace have come back positive for the novel CoV, but the specific animal has not been identified <xref rid="bib0033" ref-type="bibr">[33]</xref>. More recently, several studies have suggested that bats may be the potential natural host of SARS-CoV-2 <xref rid="bib0026" ref-type="bibr">[26</xref>,<xref rid="bib0034" ref-type="bibr">34</xref>,<xref rid="bib0035" ref-type="bibr">35]</xref>. The whole genome-wide nucleotide sequence of SARS-CoV-2 is 96% identical to a bat CoV <xref rid="bib0026" ref-type="bibr">[26]</xref>. Importantly, SARS-CoV-2 has been isolated from pangolins and it was found that the isolated pangolin CoV genomes have ~85.5–92.4% similarity to SARS-CoV-2 <xref rid="bib0036" ref-type="bibr">[36]</xref>, suggesting that pangolin may be a potential intermediate host for SARS-CoV-2. However, whether SARS-CoV-2 is transmitted directly from bats or by an intermediate host requires further confirmation. Learning from the role of camels in MERS and civets in SARS, hunting for the source of SARS-CoV-2 will help determine zoonotic transmission patterns and stem the ongoing outbreak.</p></sec><sec id="sec0007"><label>4.3</label><title>Transmission route of SARS-CoV-2</title><p id="para0016">The novel CoV can be transmitted between humans via respiratory droplets. Notably, the respiratory tract is probably not the only route of transmission. Close contact is also a source of transmission of SARS-CoV-2. For example, SARS-CoV-2 can be transmitted through direct or indirect contact with mucous membranes in the eyes, mouth or nose <xref rid="bib0037" ref-type="bibr">[37]</xref>, <xref rid="bib0038" ref-type="bibr">[38]</xref>, <xref rid="bib0039" ref-type="bibr">[39]</xref>. There is also a possibility of aerosol transmission in a relatively closed environment with continuous exposure to high concentrations of aerosol. Moreover, it has been reported that COVID-19 patients have some gastrointestinal symptoms, including diarrhoea, nausea and vomiting <xref rid="bib0040" ref-type="bibr">[40</xref>,<xref rid="bib0041" ref-type="bibr">41]</xref>. A recent study showed that the enteric symptoms of COVID-19 pneumonia are associated with invaded ACE2-expressing enterocytes <xref rid="bib0042" ref-type="bibr">[42]</xref>, suggesting that the digestive tract is a potential route of SARS-CoV-2 infection besides the respiratory tract. However, additional studies are required to test this possibility. In addition, whether transmission of SARS-CoV-2 can occur via breast milk or vertically from mother to infant has not been determined.</p></sec><sec id="sec0008"><label>4.4</label><title>Susceptible population</title><p id="para0017">All populations are generally susceptible to SARS-CoV-2. The elderly and people with underlying diseases or low immune function are more likely to become severe cases <xref rid="bib0030" ref-type="bibr">[30</xref>,<xref rid="bib0043" ref-type="bibr">43]</xref>. In addition, pregnant women and newborns infected with SARS-CoV-2 are also prone to develop severe pneumonia <xref rid="bib0044" ref-type="bibr">[44</xref>,<xref rid="bib0045" ref-type="bibr">45]</xref>. Thus, these vulnerable patients should be considered as a focus in the prevention and management of SARS-CoV-2 infection.</p></sec><sec id="sec0009"><label>4.5</label><title>Incubation period</title><p id="para0018">The mean incubation period of SARS-CoV-2 is estimated to be 3–7 days (range, 2–14 days) <xref rid="bib0046" ref-type="bibr">[46</xref>,<xref rid="bib0047" ref-type="bibr">47]</xref>, indicating a long transmission period of SARS-CoV-2. It is estimated that SARS-CoV-2 latency is consistent with those of other known human CoVs, including non-SARS human CoVs (mean 3 days, range 2–5 days) <xref rid="bib0048" ref-type="bibr">[48]</xref>, SARS-CoV (mean 5 days, range 2–14 days) <xref rid="bib0049" ref-type="bibr">[49]</xref> and MERS-CoV (mean 5.7 days, range 2–14 days) <xref rid="bib0050" ref-type="bibr">[50]</xref>. Moreover, it has been reported that asymptomatic COVID-19 patients during their incubation periods can effectively transmit SARS-CoV-2 <xref rid="bib0051" ref-type="bibr">[51</xref>,<xref rid="bib0052" ref-type="bibr">52]</xref>, which is different from SARS-CoV because most SARS-CoV cases are infected by ‘superspreaders’ and SARS-CoV cases cannot infect susceptible persons during the incubation period <xref rid="bib0053" ref-type="bibr">[53]</xref>. Taken together, these data fully support the current period of active monitoring recommended by the WHO of 14 days.</p></sec><sec id="sec0010"><label>4.6</label><title>Basic reproduction number (R0) of SARS-CoV-2</title><p id="para0019">The basic reproduction number is a very important threshold related to the transmissibility of the virus, which is usually expressed as R nought (R<sub>0</sub>). The R<sub>0</sub> can be implicitly defined as the average number of secondary infections produced by an infectious person. It is generally believed that if R<sub>0</sub> is >1, the number of infected cases will increase exponentially and cause an epidemic or even a pandemic. Liu et al. reviewed the R<sub>0</sub> of SARS-CoV-2 and found that the estimates ranged from 1.4–6.49, with a mean of 3.28 <xref rid="bib0054" ref-type="bibr">[54]</xref>, which is higher than that of SARS-CoV (R<sub>0</sub> of 2~5).</p></sec><sec id="sec0011"><label>4.7</label><title>Clinical presentation</title><p id="para0020">At the onset of the disease, the main manifestations of COVID-19 are fatigue, fever, dry cough, myalgia and dyspnoea, with less common symptoms being nasal congestion, headache, runny nose, sore throat, vomiting and diarrhoea. Severe patients often have dyspnoea and/or hypoxemia 1 week after onset, after which septic shock, ARDS, difficult-to-correct metabolic acidosis, and coagulation dysfunction develop rapidly. Of note, severe and critical patients can also only present with a low fever, or even no obvious fever, and mild patients show only low fever, mild fatigue and no pneumonia <xref rid="bib0040" ref-type="bibr">[40</xref>,<xref rid="bib0043" ref-type="bibr">43]</xref>. These asymptomatic or mild cases can also spread SARS-CoV-2 between humans.</p></sec><sec id="sec0012"><label>4.8</label><title>Pathological characteristics</title><p id="para0021">Recently, Xu et al. reported the pathological features of the first patient known to have died from SARS-CoV-2 infection <xref rid="bib0055" ref-type="bibr">[55]</xref>. Biopsy samples were obtained from lung tissue of the patient and it was found that the pathological features of COVID-19 are related to ARDS. For example, evident desquamation of pneumocytes and hyaline membrane formation were seen in the lung tissue, indicating ARDS. Moreover, interstitial mononuclear inflammatory infiltration was observed in lung tissue. Multinucleated giant cells with atypical enlarged pneumocytes characterised by large nuclei, prominent nucleoli and amphophilic granular cytoplasm were observed in the intra-alveolar spaces, suggesting viral cytopathic-like changes <xref rid="bib0055" ref-type="bibr">[55]</xref>. These pathological characteristics of COVID-19 are highly similar to those seen in SARS-CoV and MERS-CoV infection <xref rid="bib0056" ref-type="bibr">[56</xref>,<xref rid="bib0057" ref-type="bibr">57]</xref>. Taken together, understanding the pathological characteristics of this severe case of COVID-19 could help to provide new insights into the pathogenesis of SARS-CoV-2-infected pneumonia, which may help physicians to formulate a timely strategy for the treatment of similar severe patients and to decrease mortality.</p></sec><sec id="sec0013"><label>4.9</label><title>Computed tomography (CT) imaging characteristics</title><p id="para0022">CT is often found to be positive when patients with SARS-CoV-2 develop a persistent cough, fever and unexplained fatigue. Typical CT presentations of COVID-19 patients include bilateral pulmonary parenchymal ground-glass opacity, pulmonary consolidation and nodules, bilateral diffuse distribution, sometimes with a rounded morphology, and a peripheral lung distribution <xref rid="bib0058" ref-type="bibr">[58</xref>,<xref rid="bib0059" ref-type="bibr">59]</xref>. In the early course of disease, chest images show multiple small patchy shadows and interstitial changes, which are evident in the lung periphery. Severe cases can spread to the bronchi with progress of the disease, gradually spread to the whole lung, and with infrequent interlobar pleural thickening and pleural effusion.</p></sec><sec id="sec0014"><label>4.10</label><title>Detection of SARS-CoV-2</title><p id="para0023">Rapid and accurate detection of SARS-CoV-2 is essential to control the outbreak of COVID-19. Nucleic acid detection is a major method of laboratory diagnosis. Reverse transcription quantitative PCR (RT-qPCR) is a molecular biological diagnosis technology based on nucleic acid sequences. The complete SARS-CoV-2 genome sequences are available in GenBank. Thus, the nucleic acid of SARS-CoV-2 can be detected by RT-qPCR or by viral gene sequencing of nasopharyngeal and oropharyngeal swabs, stool, sputum or blood samples <xref rid="bib0060" ref-type="bibr">[60</xref>,<xref rid="bib0061" ref-type="bibr">61]</xref>. However, collection of these specimen types by healthcare workers requires close contact with patients, which poses a risk of spreading the virus to healthcare workers. Moreover, collection of nasopharyngeal or oropharyngeal specimens may cause bleeding, especially in patients with thrombocytopenia <xref rid="bib0032" ref-type="bibr">[32]</xref>. Importantly, To et al. found that SARS-CoV-2 could be effectively detected in the saliva specimens of infected patients <xref rid="bib0062" ref-type="bibr">[62]</xref>, suggesting that saliva is a promising non-invasive specimen type for diagnosis, monitoring and infection control of COVID-19 patients.</p><p id="para0024">Besides RT-qPCR, Zhang et al. described a protocol using the CRISPR-based SHERLOCK (Specific High-sensitivity Enzymatic Reporter UnLOCKing) technique for the detection of SARS-CoV-2 <xref rid="bib0063" ref-type="bibr">[63]</xref>. Using synthetic SARS-CoV-2 virus RNA fragments, the authors found that this technique is able to consistently detect target sequences of SARS-CoV-2 in a range between 20 and 200 aM (10–100 copies per microlitre of input). This test can be read out using a dipstick in <1 h, without requiring elaborate instrumentation <xref rid="bib0063" ref-type="bibr">[63]</xref>. Compared with RT-qPCR, the SHERLOCK technique is more accurate and the detection time is reduced by one-half. Thus, use of the SHERLOCK technique for the detection of SARS-CoV-2 in clinical patient samples is expected.</p></sec></sec><sec id="sec0015"><label>5</label><title>Treatments</title><p id="para0025">Suspected and confirmed cases should be treated in designated hospitals with effective isolation and protective conditions. Suspected cases should be treated in a single room and isolated, and confirmed cases can be treated in the same ward. Moreover, critical cases need to be admitted to the intensive care unit as soon as possible.</p><sec id="sec0016"><label>5.1</label><title>General treatments</title><p id="para0026">General treatment strategies include bed rest and supportive treatments, ensuring sufficient energy intake, maintaining a constant internal environment (water, electrolytes and other internal environment factors) and monitoring vital signs (heart rate, pulse, blood pressure, oxygen saturation, respiratory rate, etc.).</p></sec><sec id="sec0017"><label>5.2</label><title>Antiviral therapy</title><sec id="sec0018"><label>5.2.1</label><title>Interferon-alpha (IFNα)</title><p id="para0027">IFNα is a member of the family of type I IFNs that plays an important role in host resistance to viral infection. IFNα suppresses viral infection by directly interfering with replication of the virus and by promoting both innate and adaptive immune responses. In vitro experiments showed that IFNα effectively inhibits the replication of SARS-CoV <xref rid="bib0064" ref-type="bibr">[64</xref>,<xref rid="bib0065" ref-type="bibr">65]</xref>. It has also been reported that cynomolgus monkeys are protected from infection with SARS CoV by treatment with IFNα <xref rid="bib0066" ref-type="bibr">[66]</xref>. Moreover, the therapeutic benefit of synthetic recombinant IFNα for patients with SARS was demonstrated in a pilot clinical trial <xref rid="bib0067" ref-type="bibr">[67]</xref>. Thus, IFNα should be considered a candidate drug for COVID-19 therapy.</p></sec><sec id="sec0019"><label>5.2.2</label><title>Lopinavir/ritonavir (Kaletra)</title><p id="para0028">Lopinavir/ritonavir was first known as a protease inhibitor that interferes with the replication and synthesis of human immunodeficiency virus (HIV), leading to the production of immature, non-infectious virus particles <xref rid="bib0068" ref-type="bibr">[68</xref>,<xref rid="bib0069" ref-type="bibr">69]</xref>. It has been reported that ritonavir and lopinavir can bind to the endopeptidase C30 of SARS-CoV-2 protease as evaluated by molecular models <xref rid="bib0070" ref-type="bibr">[70]</xref>. This suggests that lopinavir/ritonavir may exert an antiviral effect by inhibiting protein synthesis of SARS-CoV-2. In addition, several lines of evidence showed that treatment with lopinavir/ritonavir alone or in combination with other antiviral drugs was shown to improve the outcome of severe patients with SARS or MERS by ameliorating ARDS <xref rid="bib0071" ref-type="bibr">[71]</xref>, <xref rid="bib0072" ref-type="bibr">[72]</xref>, <xref rid="bib0073" ref-type="bibr">[73]</xref>. Given that SARS-CoV-2 is similar to these two viruses, lopinavir/ritonavir may have a beneficial effect on COVID-19. Future studies are needed to test this possibility.</p></sec><sec id="sec0020"><label>5.2.3</label><title>Ribavirin</title><p id="para0029">Ribavirin is a nucleoside analogue with broad antiviral activity. It can prevent the replication of RNA and DNA viruses by suppressing the activity of inosine monophosphate dehydrogenase, which is required for the synthesis of guanosine triphosphate (GTP). Ribavirin was widely used to treat SARS patients with or without concomitant use of steroids during the outbreak of SARS in Hong Kong <xref rid="bib0074" ref-type="bibr">[74]</xref>, <xref rid="bib0075" ref-type="bibr">[75]</xref>, <xref rid="bib0076" ref-type="bibr">[76]</xref>. Thus, ribavirin could be considered as a treatment option for COVID-19 patients.</p></sec><sec id="sec0021"><label>5.2.4</label><title>Chloroquine</title><p id="para0030">Chloroquine is a widely used antimalarial and autoimmune disease drug. Recently, chloroquine has been reported as a potential broad-spectrum antiviral drug <xref rid="bib0077" ref-type="bibr">[77</xref>,<xref rid="bib0078" ref-type="bibr">78]</xref>. Wang et al. found that chloroquine effectively suppresses the recently emerged novel CoV (SARS-CoV-2) in vitro <xref rid="bib0079" ref-type="bibr">[79]</xref>. Chloroquine is a cheap and safe drug that has been used for more than 70 years and thus it is potentially clinically applicable against COVID-19.</p></sec><sec id="sec0022"><label>5.2.5</label><title>Arbidol (umifenovir)</title><p id="para0031">Arbidol is an antiviral drug against influenza infection that is widely used in Russia and China. Arbidol and arbidol mesylate were shown to have a potent inhibitory effect in reducing the reproduction of SARS-CoV in vitro <xref rid="bib0080" ref-type="bibr">[80]</xref>. Low-level evidence including a retrospective cohort study, case reports and case series revealed that arbidol alone or combined with antiviral drugs produced certain benefits in the treatment of COVID-19 pneumonia <xref rid="bib0081" ref-type="bibr">[81]</xref>, <xref rid="bib0082" ref-type="bibr">[82]</xref>, <xref rid="bib0083" ref-type="bibr">[83]</xref>. Currently, many randomised clinical controlled trials are being carried out studying the efficacy of Arbidol on COVID-19 pneumonia in China.</p></sec><sec id="sec0023"><label>5.2.6</label><title>Remdesivir</title><p id="para0032">The nucleoside analogue remdesivir (GS-5734) was reported to inhibit SARS-CoV and MERS-CoV in vivo <xref rid="bib0084" ref-type="bibr">[84</xref>,<xref rid="bib0085" ref-type="bibr">85]</xref>. More recently, an in vitro study showed that remdesivir potently blocked SARS-CoV-2 infection at low-micromolar concentrations and showed a high selectivity index <xref rid="bib0079" ref-type="bibr">[79]</xref>. In addition, the first case of SARS-CoV-2 infection in the USA was treated with intravenous remdesivir when the patient's condition deteriorated <xref rid="bib0041" ref-type="bibr">[41]</xref>. Although remdesivir has some benefits for the treatment of COVID-19 pneumonia, randomised controlled trials are still required to determine its efficacy and safety.</p><p id="para0033">Taken together, these antiviral drugs may be promising treatment options for the treatment of COVID-19. However, there are also a few points worth noting here: (i) the potential interaction of these antiviral drugs with other therapeutic drugs should be considered; (ii) adverse reactions caused by lopinavir/ritonavir, such as diarrhoea, nausea, vomiting and liver damage, should be also considered; (iii) it is not recommended to use three or more antiviral drugs at the same time, and the use of related drugs should be stopped when there are intolerable side effects; and (iv) further evaluation of the efficacy of current antiviral drugs in clinical applications is needed.</p></sec></sec><sec id="sec0024"><label>5.3</label><title>Cellular therapy</title><sec id="sec0025"><label>5.3.1</label><title>Natural killer (NK) cells</title><p id="para0034">NK cells are important immune cells necessary for defence against microbe-infected, stressed or malignant cells. Human NK cells lyse antibody-coated virus-infected cells via the process of antibody-dependent cellular cytotoxicity (ADCC) <xref rid="bib0086" ref-type="bibr">[86]</xref>. In this way, NK cells are specific to almost all virus-infected cells. Several studies have shown that NK cells can exert antiviral activity by mediating ADCC against SARS-CoV, herpes simplex virus type 1 (HSV-1), cytomegalovirus and HIV <xref rid="bib0087" ref-type="bibr">[87]</xref>, <xref rid="bib0088" ref-type="bibr">[88]</xref>, <xref rid="bib0089" ref-type="bibr">[89]</xref>. Umbilical cord blood is a promising source of allogeneic NK cells. Recently, Sorrento and Celularity have announced the launch of a clinical collaboration aimed at extending the use of CYNK-001, an allogeneic, off-the-shelf, umbilical cord blood-derived NK cell therapy, to the treatment of the newly emerged SARS-CoV-2 infection <xref rid="bib0090" ref-type="bibr">[90]</xref>. Whilst developing new drugs, new vaccines or clinical trials of old drugs, carrying out NK cell therapy to enhance immunity is currently a very feasible strategy for the treatment and prevention of COVID-19 pneumonia.</p></sec><sec id="sec0026"><label>5.3.2</label><title>Mesenchymal stem cells (MSCs)</title><p id="para0035">It is well known that MSCs have strong anti-inflammatory and immunomodulatory functions. Umbilical cord blood and placenta are good sources of MSCs. Numerous studies have shown that treatment with MSCs can ameliorate acute/chronic lung injury and ARDS by suppressing the infiltration of immune cells to pulmonary tissues and pro-inflammatory cytokine secretion <xref rid="bib0091" ref-type="bibr">[91]</xref>, <xref rid="bib0092" ref-type="bibr">[92]</xref>, <xref rid="bib0093" ref-type="bibr">[93]</xref>, <xref rid="bib0094" ref-type="bibr">[94]</xref>. In addition, MSCs contribute to reducing lung fibrosis and enhancing tissue repair <xref rid="bib0095" ref-type="bibr">[95</xref>,<xref rid="bib0096" ref-type="bibr">96]</xref>. Besides routine antiviral treatment, it is important to treat cytokine storm syndromes, ARDS and acute lung injury in patients with severe COVID-19 to prevent progression of the disease and to reduce mortality. Thus, MSCs may be a promising therapeutic option.</p></sec></sec><sec id="sec0027"><label>5.4</label><title>Immunotherapy</title><sec id="sec0028"><label>5.4.1</label><title>Convalescent plasma therapy</title><p id="para0036">Antiviral antibodies (IgG, IgA, IgM, IgE and IgD) found in convalescent plasma from recovered patients can effectively treat patients with viral infections. Convalescent plasma therapy has been widely used in infectious diseases such as poliomyelitis, influenza A (H5N1) and Ebola <xref rid="bib0097" ref-type="bibr">[97]</xref>, <xref rid="bib0098" ref-type="bibr">[98]</xref>, <xref rid="bib0099" ref-type="bibr">[99]</xref>. In addition, such passive immunisation can also be achieved by using convalescent plasma from patients with SARS-CoV infection. It has been reported that a small number of SARS-CoV-infected patients in Taiwan and Hong Kong received treatment with convalescent plasma during the early course of the disease with certain clinical benefits, including a reduction of plasma viral load from ~10<sup>5</sup> copies/mL to undetectable levels 24 h after plasma transfusion <xref rid="bib0100" ref-type="bibr">[100]</xref>, <xref rid="bib0101" ref-type="bibr">[101]</xref>, <xref rid="bib0102" ref-type="bibr">[102]</xref>. Thus, convalescent plasma could, theoretically, be a promising option for the treatment and prevention of SARS-CoV-2 infection, although this has not been tested clinically.</p></sec><sec id="sec0029"><label>5.4.2</label><title>Monoclonal antibodies</title><p id="para0037">Remission of the SARS-CoV-2 epidemic may depend on the development of monoclonal antibodies. Previous studies have identified a number of effective monoclonal antibodies that target the SARS-CoV spike protein to prevent the virus from entering host cells <xref rid="bib0103" ref-type="bibr">[103]</xref>, <xref rid="bib0104" ref-type="bibr">[104]</xref>, <xref rid="bib0105" ref-type="bibr">[105]</xref>. The 193-amino acid (residues 318–510) receptor-binding domain (RBD) of the spike protein is the key target of neutralising monoclonal antibodies <xref rid="bib0106" ref-type="bibr">[106]</xref>. The SARS-CoV neutralising monoclonal antibodies CR3014 and CR3022 were found to bind non-competitively to the SARS-CoV RBD and neutralised the virus in a synergistic manner <xref rid="bib0104" ref-type="bibr">[104]</xref>. A recent study showed that CR3022 could combine effectively with SARS-CoV-2 RBD (K<sub>D</sub> of 6.3 nM) <xref rid="bib0107" ref-type="bibr">[107]</xref>. Moreover, the epitope of CR3022 does not overlap with the binding site of ACE2 in the SARS-CoV-2 RBD <xref rid="bib0107" ref-type="bibr">[107]</xref>. Thus, CR3022 could be a promising therapeutic candidate, alone or in combination with other neutralising monoclonal antibodies, for the treatment of COVID-19 pneumonia.</p></sec></sec><sec id="sec0030"><label>5.5</label><title>Chinese medicine</title><p id="para0038">Glycyrrhizin, an active component of liquorice roots used in Chinese medicine, could effectively inhibit the replication of SARS-associated CoV in vitro <xref rid="bib0108" ref-type="bibr">[108</xref>,<xref rid="bib0109" ref-type="bibr">109]</xref>. Furthermore, high doses of glycyrrhizin have been used in clinical trials and the compound was reported to be clinically effective for the treatment of SARS at that time <xref rid="bib0110" ref-type="bibr">[110</xref>,<xref rid="bib0111" ref-type="bibr">111]</xref>. Recently, glycyrrhizin was predicted to have the ability to bind ACE2 with potential anti-COVID-19 effects <xref rid="bib0112" ref-type="bibr">[112]</xref>. Hesperetin, a well-known traditional Chinese medicine, is a natural predominant flavonoid found in citrus fruits. Hesperetin dose-dependently suppresses the cleavage activity of the 3C-like protease (3CLpro) of SARS-CoV in cell-free and cell-based assays <xref rid="bib0113" ref-type="bibr">[113]</xref>. Hesperetin was also reported to have the potential to inhibit ACE2 and therefore block infection with SARS-CoV-2 <xref rid="bib0112" ref-type="bibr">[112]</xref>. Baicalin, another traditional Chinese herbal medicine, is a flavone isolated from <italic>Scutellaria baicalensis</italic>. It has been shown that baicalin has antiviral activity against 10 clinical isolates of SARS-CoV by neutralisation tests <xref rid="bib0114" ref-type="bibr">[114]</xref>. In addition, quercetin is a plant flavone that is widely used in traditional Chinese medicine and botanical medicine. Quercetin was reported to exert antiviral effects by inhibiting the 3CLpro of SARS-CoV <xref rid="bib0115" ref-type="bibr">[115]</xref> and blocking the entry of SARS-CoV into host cells <xref rid="bib0116" ref-type="bibr">[116]</xref>. Therefore, these studies suggest that Chinese medicine also plays a key role in the prevention and treatment of COVID-19 pneumonia.</p></sec></sec><sec id="sec0031"><label>6</label><title>Conclusion and future directions</title><p id="para0039">SARS-CoV first appeared in 2002 and rapidly spread to 32 countries and regions, after which the world then experienced the outbreak of MERS-CoV in 2012. Recently, the newly emerged SARS-CoV-2 is undoubtedly a warning. It has been confirmed that SARS-CoV-2 enters lung cells by binding to ACE2. Besides pulmonary tissue, ACE2 is also highly expressed in other tissues including bile duct, liver, gastrointestinal organs (small intestine, duodenum), oesophagus, testis and kidney <xref rid="bib0042" ref-type="bibr">[42</xref>,<xref rid="bib0117" ref-type="bibr">[117]</xref>, <xref rid="bib0118" ref-type="bibr">[118]</xref>, <xref rid="bib0119" ref-type="bibr">[119]</xref>]. Thus, these organs may also be damaged by SARS-CoV-2. Currently, SARS-CoV-2 has spread rapidly in multiple countries, caused severe illness and sustained human-to-human transmission, making it a concerning and serious public-health threat. Considering the global threat to health caused by SARS-CoV-2, effective prevention and treatment of COVID-19 pneumonia will be urgently needed. However, the development of drugs for pathogenic SARS-CoV-2 is still a major problem for humans, and there are currently no officially approved drugs to treat COVID-19. In view of the epidemiological characteristics of SARS-CoV-2, it is crucial to interrupt the spread of the virus through epidemic prevention and control methods, such as isolating infected patients and controlling the source of infection. At the same time, wild animal trafficking must be banned to reduce the spread of CoVs. In addition, it is necessary to make full use of the currently limited evidence for therapeutic drugs to develop strategies of drug application to prevent and control the transmission of SARS-CoV-2. It has been confirmed that the genome sequence of SARS-CoV-2 shares high identity with that of bat and human SARS-CoVs. A number of antiviral drugs and treatment methods for SARS-CoV infection have also been considered for the treatment and prevention of COVID-19 pneumonia.</p><p id="para0040">We have been warned three times in recent years. CoVs are highly vulnerable to public-health intervention strategies, but the increasing incidence of CoV emergence in livestock animal populations and the identification of novel CoVs in reservoir species do not support this view. Therefore, in addition to developing new drugs and clinical trials of old drugs, the design and development of vaccines for SARS-CoV-2 is also needed. 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