Antiviral therapy in management of COVID-19: a systematic review on current evidence
Identifieur interne : 001291 ( Pmc/Corpus ); précédent : 001290; suivant : 001292Antiviral therapy in management of COVID-19: a systematic review on current evidence
Auteurs : Mahmoud Yousefifard ; Alireza Zali ; Kosar Mohamed Ali ; Arian Madani Neishaboori ; Afshin Zarghi ; Mostafa Hosseini ; Saeed SafariSource :
- Archives of Academic Emergency Medicine [ 2645-4904 ] ; 2020.
Abstract
The purpose of the current systematic review is to evaluate the efficacy of antiviral therapies in treatment of COVID-19. In addition, clinical trials on the efficacy of antiviral therapies in the management of Severe Acute Respiratory Syndrome coronavirus (SARS-Cov) or Middle East Respiratory Syndrome coronavirus (MERS-CoV) have also been reviewed, in order to identify potential treatment options for COVID-19.
An extensive search was performed in Medline, Embase, Scopus, Web of Science and CENTRAL databases until the end of March 15, 2020. Two independent researchers performed the screening, and finally the related studies were included.
Only one clinical trial on the efficacy of antiviral therapy in management of COVID-19 was found. The results depicted that adding Lopinavir-Ritonavir to the standard treatment regimen of patients with severe COVID-19 has no benefits. Moreover, 21 case-series and case-report studies reported the prescription of antiviral agents in COVID-19, none of which can be used to determine the efficacy of antiviral therapies in confronting COVID-19. In addition, no clinical trials were found to be performed on the efficacy of antiviral agents in the management of SARS-CoV and MERS-CoV.
The current evidence impede researchers from proposing an appropriate antiviral therapy against COVID-19, making the current situation a serious concern for international organizations such as World Health Organization (WHO). In the time of the current pandemic and future epidemics, organizations such as WHO should pursue more proactive actions and plan well-designed clinical trials so that their results can be used in managing future epidemics.
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PubMed Central: 7156260
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Antiviral therapy in management of COVID-19: a systematic review on current evidence</title><author><name sortKey="Yousefifard, Mahmoud" sort="Yousefifard, Mahmoud" uniqKey="Yousefifard M" first="Mahmoud" last="Yousefifard">Mahmoud Yousefifard</name><affiliation><nlm:aff id="aff1">Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Zali, Alireza" sort="Zali, Alireza" uniqKey="Zali A" first="Alireza" last="Zali">Alireza Zali</name><affiliation><nlm:aff id="aff2">Functional Neurosurgery Research Center, Shohada Tajrish Neurosurgical Comprehensive Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Mohamed Ali, Kosar" sort="Mohamed Ali, Kosar" uniqKey="Mohamed Ali K" first="Kosar" last="Mohamed Ali">Kosar Mohamed Ali</name><affiliation><nlm:aff id="aff3">College of medicine, University of Sulaimani, Sulaimani, Iraq.</nlm:aff></affiliation></author><author><name sortKey="Madani Neishaboori, Arian" sort="Madani Neishaboori, Arian" uniqKey="Madani Neishaboori A" first="Arian" last="Madani Neishaboori">Arian Madani Neishaboori</name><affiliation><nlm:aff id="aff1">Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Zarghi, Afshin" sort="Zarghi, Afshin" uniqKey="Zarghi A" first="Afshin" last="Zarghi">Afshin Zarghi</name><affiliation><nlm:aff id="aff4">Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Hosseini, Mostafa" sort="Hosseini, Mostafa" uniqKey="Hosseini M" first="Mostafa" last="Hosseini">Mostafa Hosseini</name><affiliation><nlm:aff id="aff5">Pediatric Chronic Kidney Disease Research Center, Tehran University of Medical Sciences, Tehran Iran.</nlm:aff></affiliation><affiliation><nlm:aff id="aff6">Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Safari, Saeed" sort="Safari, Saeed" uniqKey="Safari S" first="Saeed" last="Safari">Saeed Safari</name><affiliation><nlm:aff id="aff7">Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation><affiliation><nlm:aff id="aff8">Emergency Department, Shohadye Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmc">7156260</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156260</idno><idno type="RBID">PMC:7156260</idno><idno type="pmid">NONE</idno><date when="2020">2020</date><idno type="wicri:Area/Pmc/Corpus">001291</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001291</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Antiviral therapy in management of COVID-19: a systematic review on current evidence</title><author><name sortKey="Yousefifard, Mahmoud" sort="Yousefifard, Mahmoud" uniqKey="Yousefifard M" first="Mahmoud" last="Yousefifard">Mahmoud Yousefifard</name><affiliation><nlm:aff id="aff1">Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Zali, Alireza" sort="Zali, Alireza" uniqKey="Zali A" first="Alireza" last="Zali">Alireza Zali</name><affiliation><nlm:aff id="aff2">Functional Neurosurgery Research Center, Shohada Tajrish Neurosurgical Comprehensive Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Mohamed Ali, Kosar" sort="Mohamed Ali, Kosar" uniqKey="Mohamed Ali K" first="Kosar" last="Mohamed Ali">Kosar Mohamed Ali</name><affiliation><nlm:aff id="aff3">College of medicine, University of Sulaimani, Sulaimani, Iraq.</nlm:aff></affiliation></author><author><name sortKey="Madani Neishaboori, Arian" sort="Madani Neishaboori, Arian" uniqKey="Madani Neishaboori A" first="Arian" last="Madani Neishaboori">Arian Madani Neishaboori</name><affiliation><nlm:aff id="aff1">Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Zarghi, Afshin" sort="Zarghi, Afshin" uniqKey="Zarghi A" first="Afshin" last="Zarghi">Afshin Zarghi</name><affiliation><nlm:aff id="aff4">Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Hosseini, Mostafa" sort="Hosseini, Mostafa" uniqKey="Hosseini M" first="Mostafa" last="Hosseini">Mostafa Hosseini</name><affiliation><nlm:aff id="aff5">Pediatric Chronic Kidney Disease Research Center, Tehran University of Medical Sciences, Tehran Iran.</nlm:aff></affiliation><affiliation><nlm:aff id="aff6">Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author><author><name sortKey="Safari, Saeed" sort="Safari, Saeed" uniqKey="Safari S" first="Saeed" last="Safari">Saeed Safari</name><affiliation><nlm:aff id="aff7">Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation><affiliation><nlm:aff id="aff8">Emergency Department, Shohadye Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</nlm:aff></affiliation></author></analytic><series><title level="j">Archives of Academic Emergency Medicine</title><idno type="eISSN">2645-4904</idno><imprint><date when="2020">2020</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background:</title><p>The purpose of the current systematic review is to evaluate the efficacy of antiviral therapies in treatment of COVID-19. In addition, clinical trials on the efficacy of antiviral therapies in the management of Severe Acute Respiratory Syndrome coronavirus (SARS-Cov) or Middle East Respiratory Syndrome coronavirus (MERS-CoV) have also been reviewed, in order to identify potential treatment options for COVID-19.</p></sec><sec><title>Method:</title><p>An extensive search was performed in Medline, Embase, Scopus, Web of Science and CENTRAL databases until the end of March 15, 2020. Two independent researchers performed the screening, and finally the related studies were included.</p></sec><sec><title>Results:</title><p>Only one clinical trial on the efficacy of antiviral therapy in management of COVID-19 was found. The results depicted that adding Lopinavir-Ritonavir to the standard treatment regimen of patients with severe COVID-19 has no benefits. Moreover, 21 case-series and case-report studies reported the prescription of antiviral agents in COVID-19, none of which can be used to determine the efficacy of antiviral therapies in confronting COVID-19. In addition, no clinical trials were found to be performed on the efficacy of antiviral agents in the management of SARS-CoV and MERS-CoV.</p></sec><sec><title>Conclusion:</title><p>The current evidence impede researchers from proposing an appropriate antiviral therapy against COVID-19, making the current situation a serious concern for international organizations such as World Health Organization (WHO). In the time of the current pandemic and future epidemics, organizations such as WHO should pursue more proactive actions and plan well-designed clinical trials so that their results can be used in managing future epidemics.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Wu, Z" uniqKey="Wu Z">Z Wu</name></author><author><name sortKey="Mcgoogan, Jm" uniqKey="Mcgoogan J">JM McGoogan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Alavi Moghaddam, M" uniqKey="Alavi Moghaddam M">M Alavi-Moghaddam</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Luk, Hkh" uniqKey="Luk H">HKH Luk</name></author><author><name sortKey="Li, X" uniqKey="Li X">X Li</name></author><author><name sortKey="Fung, J" uniqKey="Fung J">J Fung</name></author><author><name sortKey="Lau, Skp" uniqKey="Lau S">SKP Lau</name></author><author><name sortKey="Woo, Pcy" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Arch Acad Emerg Med</journal-id><journal-id journal-id-type="iso-abbrev">Arch Acad Emerg Med</journal-id><journal-id journal-id-type="publisher-id">AAEM</journal-id><journal-title-group><journal-title>Archives of Academic Emergency Medicine</journal-title></journal-title-group><issn pub-type="epub">2645-4904</issn><publisher><publisher-name>Shahid Beheshti University of Medical Sciences</publisher-name><publisher-loc>Tehran, Iran</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmc">7156260</article-id><article-id pub-id-type="publisher-id">e45</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title>Antiviral therapy in management of COVID-19: a systematic review on current evidence</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Yousefifard</surname><given-names>Mahmoud</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Zali</surname><given-names>Alireza</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author"><name><surname>Mohamed Ali</surname><given-names>Kosar</given-names></name><xref ref-type="aff" rid="aff3">3</xref></contrib><contrib contrib-type="author"><name><surname>Madani Neishaboori</surname><given-names>Arian</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author"><name><surname>Zarghi</surname><given-names>Afshin</given-names></name><xref ref-type="aff" rid="aff4">4</xref></contrib><contrib contrib-type="author"><name><surname>Hosseini</surname><given-names>Mostafa</given-names></name><xref ref-type="aff" rid="aff5">5</xref><xref ref-type="aff" rid="aff6">6</xref></contrib><contrib contrib-type="author"><name><surname>Safari</surname><given-names>Saeed</given-names></name><xref ref-type="aff" rid="aff7">7</xref><xref ref-type="aff" rid="aff8">8</xref></contrib></contrib-group><aff id="aff1"><label>1</label>Physiology Research Center, Iran University of Medical Sciences, Tehran, Iran.</aff><aff id="aff2"><label>2</label>Functional Neurosurgery Research Center, Shohada Tajrish Neurosurgical Comprehensive Center of Excellence, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</aff><aff id="aff3"><label>3</label>College of medicine, University of Sulaimani, Sulaimani, Iraq.</aff><aff id="aff4"><label>4</label>Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</aff><aff id="aff5"><label>5</label>Pediatric Chronic Kidney Disease Research Center, Tehran University of Medical Sciences, Tehran Iran.</aff><aff id="aff6"><label>6</label>Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.</aff><aff id="aff7"><label>7</label>Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</aff><aff id="aff8"><label>8</label>Emergency Department, Shohadye Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.</aff><author-notes><corresp id="cor">Corresponding authors: Dr. Saeed Safari. Department of Emergency Medicine, Shohadye Tajrish Hospital, Tajrish Squared, Tehran, Iran. Email: safari266@gmail.com; Phone/Fax: 00982122721155. Prof. Mostafa Hosseini. Department of Epidemiology and Biostatistics School of Public Health, Tehran University of Medical Sciences, Poursina Ave, Tehran, Iran. Email: mhossein110@yahoo.com ; Phone: 00982188989125.</corresp></author-notes><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>6</day><month>4</month><year>2020</year></pub-date><volume>8</volume><issue>1</issue><elocation-id>e45</elocation-id><history><date date-type="received"><month>3</month><year>2020</year></date><date date-type="accepted"><month>3</month><year>2020</year></date></history><permissions><license license-type="open-access"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License, (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/3.0/">http://creativecommons.org/licenses/by/3.0/</ext-link>) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><sec><title>Background:</title><p>The purpose of the current systematic review is to evaluate the efficacy of antiviral therapies in treatment of COVID-19. In addition, clinical trials on the efficacy of antiviral therapies in the management of Severe Acute Respiratory Syndrome coronavirus (SARS-Cov) or Middle East Respiratory Syndrome coronavirus (MERS-CoV) have also been reviewed, in order to identify potential treatment options for COVID-19.</p></sec><sec><title>Method:</title><p>An extensive search was performed in Medline, Embase, Scopus, Web of Science and CENTRAL databases until the end of March 15, 2020. Two independent researchers performed the screening, and finally the related studies were included.</p></sec><sec><title>Results:</title><p>Only one clinical trial on the efficacy of antiviral therapy in management of COVID-19 was found. The results depicted that adding Lopinavir-Ritonavir to the standard treatment regimen of patients with severe COVID-19 has no benefits. Moreover, 21 case-series and case-report studies reported the prescription of antiviral agents in COVID-19, none of which can be used to determine the efficacy of antiviral therapies in confronting COVID-19. In addition, no clinical trials were found to be performed on the efficacy of antiviral agents in the management of SARS-CoV and MERS-CoV.</p></sec><sec><title>Conclusion:</title><p>The current evidence impede researchers from proposing an appropriate antiviral therapy against COVID-19, making the current situation a serious concern for international organizations such as World Health Organization (WHO). In the time of the current pandemic and future epidemics, organizations such as WHO should pursue more proactive actions and plan well-designed clinical trials so that their results can be used in managing future epidemics.</p></sec></abstract><kwd-group><title>Key Words</title><kwd>COVID-19</kwd><kwd>Treatment</kwd><kwd>Antiviral Therapy</kwd></kwd-group></article-meta></front><body><sec sec-type="intro"><title>Introduction</title><p>In the late 2019, a novel type of coronavirus emerged from Wuhan, China, causing patients to show pneumonia-like symptoms (<xref rid="B1" ref-type="bibr">1</xref>, <xref rid="B2" ref-type="bibr">2</xref>). Later on, the virus spread around the world, and the World Health Organization announced a COVID-19 pandemic in March 2020. By March 17, 2020, 190,000 COVID-19 cases and approximately 7500 deaths from the virus were identified (3). This large number of infected patients in only three months since the first reported case of COVID-19 demonstrates that the disease is extremely contagious.</p><p>COVID-19 is caused by Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2), which belongs to the family Coronaviridae. The family that has been responsible for two other viral outbreaks in recent years, the first of which was in 2003 caused by Severe Acute Respiratory Syndrome coronavirus (SARS-CoV) (<xref rid="B4" ref-type="bibr">4</xref>). The second outbreak occurred in 2012 and 2015 due to the spread of Middle East respiratory syndrome coronavirus (MERS-CoV), another virus from the same family (<xref rid="B5" ref-type="bibr">5</xref>, <xref rid="B6" ref-type="bibr">6</xref>). These two epidemics infected many people at the time of their peak, but after the diseases regressed, limited reports of laboratory accidents or animal-to-human transmission were published.</p><p>Until today, no treatments have been reported for COVID-19 (<xref rid="B7" ref-type="bibr">7</xref>). Although some case-reports or observational studies have reported a few antiviral drugs being effective in improving the outcome of COVID-19 patients (<xref rid="B8" ref-type="bibr">8</xref>), no definitive cure has been discovered so far. Recently, a Chinese research team proposed a treatment protocol for management of COVID-19 patients, which included moxifloxacin, levofloxacin (consider tolerance) and arbidol administration (<xref rid="B8" ref-type="bibr">8</xref>). However, the underlying evidence for the mentioned treatment protocol is unclear, as there are no clinical trials performed on this matter. Several antiviral therapies have been considered to be potentially effective in treating COVID-19, including oseltamivir, ganciclovir, arbidol and lopinavir / ritonavir. Many clinical trials are currently underway to evaluate the efficacy of different medications on the outcome of COVID-19 patients (<xref rid="B9" ref-type="bibr">9</xref>), but their results have not been published yet. On the other hand, the quality of these studies is rather unclear.</p><p>Treatments used for SARS-CoV or MERS-CoV may be useful in the treatment of COVID-19, due to the fact that all of these viruses are from the same family, and they all cause respiratory diseases. Nevertheless, a consensus is yet to be reached on this matter. The primary objective of the current systematic review is to evaluate the evidence underlying the efficacy and safety of antiviral therapies in treatment of COVID-19 in the current pandemic. Another goal for the present study is to investigate the clinical trials performed in recent years on the effects of antiviral therapies on SARS-CoV or MERS-CoV to propose potential existing treatments for COVID-19.</p></sec><sec sec-type="methods"><title>Methods</title><p><bold>Study design</bold></p><p>The present systematic review was performed in two sections. In the first section, current clinical evidence about the efficacy of antiviral treatments in management of COVID-19, namely the COVID-19 antiviral therapy section, is presented. The second part provides a review of clinical trials conducted on SARS-CoV and MERS-CoV to find proposed antiviral therapies, namely the SARS-MERS antiviral therapy section.</p><p><bold>Selection criteria</bold></p><p>In the COVID-19 antiviral therapy section, all types of performed clinical studies, aiming to evaluate the efficacy and safety of antiviral drugs were included. Exclusion criteria comprised in vitro studies, animal studies, guidelines, and review studies.</p><p>In the SARS-MERS antiviral therapy section, inclusion criteria consisted of clinical trials on the efficacy and safety of antiviral drugs administered for management of ARS-CoV and MERS-CoV. The exclusion criteria in this section contained observational studies, guides, animal studies, and review articles. Since SARS and MERS outbreaks happened in recent years, and there was the opportunity for conduction of clinical trials, only clinical trials were included in this section, as they provide the highest level of evidence. In this section, antiviral therapies for COVID-19 are to be suggested, so the provided underlying evidence should be of highest validity.</p><p><bold>Search strategy</bold></p><p>An extensive search was performed on Medline (via PubMed), Embase, Scopus, CENTRAL, and Web of Science databases. The keywords were selected using expert opinions, Mesh, Emtree and related article titles. </p><p>The keywords in the COVID-19 antiviral therapy section were the only keywords associated with COVID-19. Since a small number of articles were published about the treatment, and the use of antiviral treatments were prevalently not mentioned in the abstracts of the articles, keywords related to “antiviral therapy” were not included in the search. Also, the search date was chosen to be from early 2019 until March 15, 2020, since the first report of COVID-19 was published in late 2019.</p><p>The keywords in the SARS-MERS antiviral therapy section included keywords related to SARS-CoV and MERS-CoV in combination with standard filters for clinical trials. Similar to the previous section, keywords related to antiviral therapy were not included in the search, due to the limited number of studies. The time range for search was set to be from the inception of the database until March 15, 2020. Search strategy in Medline is presented in <xref rid="T1" ref-type="table">Table 1</xref>. In addition to the systematic search, an extensive search was also performed on google and google scholar search engines and in the article bibliographies.</p><p><bold>Data collection</bold></p><p>Two independent researchers reviewed the titles and abstracts of the records obtained from the databases and selected related articles. Next, full texts of these articles were collected and reviewed carefully. Finally, related articles suitable based on inclusion and exclusion criteria were included in the present systematic review. Then, the two researchers summarized the articles and collected data including the name of the first author, publication year, country in which the study was conducted, type of the study, sample size, age and sex distribution of the patients, the drug used, dose and duration of administration, route of administration and treatment outcome. Any disagreements were resolved by a discussion with a third researcher.</p></sec><sec sec-type="results"><title>Results</title><p><bold>Studies on COVID-19</bold></p><p><bold>Characteristics</bold></p><p>The initial search yielded 4997 articles. After eliminating duplicates, 2485 records were reviewed, and 22 studies were included in the current systematic review (<xref ref-type="fig" rid="F1">Figure 1</xref>) (<xref rid="B10" ref-type="bibr">10</xref>-<xref rid="B31" ref-type="bibr">31</xref>). 20 articles were conducted in China, one article was conducted in South Korea and one study was performed in Singapore. Only one clinical trial was found, which evaluated the efficacy of Lopinavir-Ritonavir in treating patients with severe COVID-19 (<xref rid="B10" ref-type="bibr">10</xref>). Among the included articles, 16 were case-series (<xref rid="B11" ref-type="bibr">11</xref>-<xref rid="B13" ref-type="bibr">13</xref>, <xref rid="B15" ref-type="bibr">15</xref>, <xref rid="B16" ref-type="bibr">16</xref>, <xref rid="B19" ref-type="bibr">19</xref>-<xref rid="B23" ref-type="bibr">23</xref>, <xref rid="B25" ref-type="bibr">25</xref>-<xref rid="B29" ref-type="bibr">29</xref>, <xref rid="B31" ref-type="bibr">31</xref>) and 5 were case-reports (<xref rid="B14" ref-type="bibr">14</xref>, <xref rid="B17" ref-type="bibr">17</xref>, <xref rid="B18" ref-type="bibr">18</xref>, <xref rid="B24" ref-type="bibr">24</xref>, <xref rid="B30" ref-type="bibr">30</xref>). The articles studied 2856 COVID-19 patients, 1883 (65.9%) of whom were treated with antiviral agents. The most commonly used antivirals were lopinavir / ritonavir, oseltamivir, ribavirin and arbidol, respectively. Route and duration of administration were not reported in most of the studies. The most common route of administration among the studies was oral administration, and the duration of administration varied from two to 14 days. All of the studies used other therapies, such as antibiotics, immunoglobin, interferon, glucocorticoids, methylprednisolone, and antiparasitic and antifungal drugs in addition to the antiviral therapy to manage COVID-19 patients (<xref rid="T2" ref-type="table">Table 2</xref>).</p><p><bold>Antiviral therapy for management of COVID-19</bold></p><p>The only clinical trial found was performed on 199 patients with severe COVID-19, using Lopinavir-Ritonavir regimen. In this randomized open-labeled clinical trial, patients were divided into two groups: lopinavir-ritonavir (99 patients) group and standard treatment group. In addition to lopinavir-ritonavir (400 mg / 100 mg, twice daily; 14 days), standard treatments such as antibiotics, invasive or non-invasive ventilation and extracorporeal membrane oxygenation (ECMO) and vasopressor were also used. The findings of this study showed that patients receiving lopinavir-ritonavir had a similar recovery process to those receiving standard treatment. 28-day mortality and viral RNA load were not significantly different between the two groups (<xref rid="B10" ref-type="bibr">10</xref>). The researchers concluded that lopinavir-ritonavir administration in patients with severe COVID-19 was not more effective than the standard treatment.</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>Flow diagram of screening process of present systematic review. RCT: Randomized clinical trial.</p></caption><graphic xlink:href="aaem-8-e45-g001"></graphic></fig><table-wrap id="T1" position="float"><label>Table 1</label><caption><p>Search queries in Medline database</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1"><bold>Section</bold></th><th align="left" rowspan="1" colspan="1"><bold>Search query</bold></th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">COVID-19 antiviral therapy</td><td align="left" rowspan="1" colspan="1">Coronavirus[tiab] OR COVID19[tiab] OR 2019-nCoV[tiab] OR COVID19 virus[tiab] OR COVID-19 virus[tiab] OR 2019-nCoV disease[tiab] OR 2019 novel coronavirus disease[tiab] OR 2019-nCoV infection[tiab] OR 2019-nCoV[tiab] OR Coronavirus disease 2019 virus[tiab] OR SARS-CoV-2[tiab] OR SARS2[tiab] OR 2019 novel coronavirus[tiab] OR 2019 novel coronavirus infection[tiab] OR coronavirus disease 2019[tiab] OR coronavirus disease-19[tiab] OR new coronavirus[tiab] OR Wuhan coronavirus[tiab] OR Wuhan seafood market pneumonia virus[tiab] OR "severe acute respiratory syndrome coronavirus 2"[Supplementary Concept] OR "COVID-19"[Supplementary Concept]</td></tr><tr><td align="left" rowspan="1" colspan="1">SARS-MERS antiviral therapy</td><td align="left" rowspan="1" colspan="1">1. “Coronavirus”[mh] OR “Betacoronavirus”[mh] OR “Middle East Respiratory Syndrome Coronavirus”[mh] OR “SARS Virus”[mh] OR Coronavirus[tiab] OR Coronaviruses[tiab] OR Deltacoronavirus[tiab] OR Deltacoronaviruses[tiab] OR Munia coronavirus HKU13[tiab] OR Coronavirus HKU15[tiab] OR Coronavirus, Rabbit[tiab] OR Rabbit Coronavirus[tiab] OR Coronaviruses, Rabbit[tiab] OR Rabbit Coronaviruses[tiab] OR Bulbul coronavirus HKU11[tiab] OR Thrush coronavirus HKU12[tiab] OR Betacoronavirus[tiab] OR Betacoronaviruses[tiab] OR Tylonycteris bat coronavirus HKU4[tiab] OR Pipistrellus bat coronavirus HKU5[tiab] OR Human coronavirus HKU1[tiab] OR HCoV-HKU1[tiab] OR Rousettus bat coronavirus HKU9[tiab] OR Middle East Respiratory Syndrome Coronavirus[tiab] OR MERS-CoV[tiab] OR MERS Virus[tiab] OR MERS Viruses[tiab] OR Virus, MERS[tiab] OR Viruses, MERS[tiab] OR Middle East respiratory syndrome-related coronavirus[tiab] OR Middle East respiratory syndrome related coronavirus[tiab] OR SARS Virus[tiab] OR Severe Acute Respiratory Syndrome Virus[tiab] OR SARS-Related Coronavirus[tiab] OR Coronavirus, SARS-Related[tiab] OR SARS Related Coronavirus[tiab] OR SARS-CoV[tiab] OR Urbani SARS-Associated Coronavirus[tiab] OR Coronavirus, Urbani SARS-Associated[tiab] OR SARS-Associated Coronavirus, Urbani[tiab] OR Urbani SARS Associated Coronavirus[tiab] OR SARS Coronavirus[tiab] OR Coronavirus, SARS[tiab] OR Severe acute respiratory syndrome-related coronavirus[tiab] OR Severe acute respiratory syndrome related coronavirus[tiab] OR SARS-Associated Coronavirus[tiab] OR Coronavirus, SARS-Associated[tiab] OR SARS Associated Coronavirus[tiab]<break></break>2. (randomized controlled trial [pt] OR controlled clinical trial [pt] OR randomized [tiab] OR placebo [tiab] OR drug therapy [sh] OR randomly [tiab] OR trial [tiab] OR groups [tiab]) NOT (animals [mh] NOT humans [mh])<break></break>3. #1 and #2</td></tr></tbody></table></table-wrap><table-wrap id="T2" position="float"><label>Table 2</label><caption><p>Clinical studies that reported anti-viral therapy in management of COVID-19</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">First author; Year; Country</th><th align="left" rowspan="1" colspan="1">Sample size</th><th align="left" rowspan="1" colspan="1">Age (year)*</th><th align="left" rowspan="1" colspan="1">Male</th><th align="left" rowspan="1" colspan="1">Status of patients</th><th align="left" rowspan="1" colspan="1">Antiviral agent</th><th align="left" rowspan="1" colspan="1">Antiviral treated patients (n)</th><th align="left" rowspan="1" colspan="1">Dosage</th><th align="left" rowspan="1" colspan="1">Route of administration</th><th align="left" rowspan="1" colspan="1">Duration of treatment</th><th align="left" rowspan="1" colspan="1">Combination</th><th align="left" rowspan="1" colspan="1">Main findings</th></tr></thead><tbody><tr><td align="left" colspan="12" rowspan="1"><bold>Randomized clinical trial</bold></td></tr><tr><td align="left" rowspan="1" colspan="1">Cao et al; 2020; China (10)</td><td align="left" rowspan="1" colspan="1">199</td><td align="left" rowspan="1" colspan="1">58 (50 to 68)</td><td align="left" rowspan="1" colspan="1">120</td><td align="left" rowspan="1" colspan="1">Severe COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Lopinavir/Ritonavir</td><td align="left" rowspan="1" colspan="1">99</td><td align="left" rowspan="1" colspan="1">400 mg/100 mg twice daily </td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">14</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Lopinavir–ritonavir administration is not superior to standard care in management of adult patients with severe COVID-19. Clinical improvement and mortality rate are similar in lopinavir–ritonavir treated and standard care groups.</td></tr><tr><td align="left" rowspan="1" colspan="1">Case-series</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Chen N; 2020; China (11)</td><td align="left" rowspan="1" colspan="1">99</td><td align="left" rowspan="1" colspan="1">21 to 82</td><td align="left" rowspan="1" colspan="1">67</td><td align="left" rowspan="1" colspan="1">COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Oseltamivir</td><td align="left" rowspan="1" colspan="1">75</td><td align="left" rowspan="1" colspan="1">75 mg twice a day</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">3 to 14 </td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Recovery rate: 31%; Mortality rate: 11%</td></tr><tr><td align="left" rowspan="1" colspan="1">Chen Q; 2020; China (12)</td><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">14 to 56</td><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19</td><td align="left" rowspan="1" colspan="1">Lopinavir/ Ritonavir</td><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">800 mg/200 mg daily</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">4 to 11</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">No mortality. Time from onset of treatment to negative result of Cov-test was 4-11 days. Length of hospital stay was 9 to 20 days.</td></tr><tr><td align="left" rowspan="1" colspan="1">Guan W; 2020; China (13)</td><td align="left" rowspan="1" colspan="1">1099</td><td align="left" rowspan="1" colspan="1">47.0 (IQR: 35.0–58.0)</td><td align="left" rowspan="1" colspan="1">637</td><td align="left" rowspan="1" colspan="1">Non-severe and severe COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Oseltamivir</td><td align="left" rowspan="1" colspan="1">393</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Administration of oseltamivir did not decrease ICU admission and need for ventilator or death</td></tr><tr><td align="left" rowspan="1" colspan="1">Hu Z; 2020; China (15) </td><td align="left" rowspan="1" colspan="1">24</td><td align="left" rowspan="1" colspan="1">5 to 95 </td><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">Asymptomatic COVID-19 infection</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">21</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">No mortality, no ICU admission, no severe complication</td></tr><tr><td align="left" rowspan="1" colspan="1">Huang C; 2020; China (16)</td><td align="left" rowspan="1" colspan="1">41</td><td align="left" rowspan="1" colspan="1">49 (IQR 41·0–58·0)</td><td align="left" rowspan="1" colspan="1">30</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19</td><td align="left" rowspan="1" colspan="1">Oseltamivir</td><td align="left" rowspan="1" colspan="1">38</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">6 patients died 28 patients were discharged</td></tr><tr><td align="left" rowspan="1" colspan="1">Liu K; 2020; China (19)</td><td align="left" rowspan="1" colspan="1">137</td><td align="left" rowspan="1" colspan="1">20 to 83</td><td align="left" rowspan="1" colspan="1">61</td><td align="left" rowspan="1" colspan="1">Severe COVID-19</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">105</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">16 patients died during the study.</td></tr><tr><td align="left" rowspan="1" colspan="1">Liu L; 2020; China (20)</td><td align="left" rowspan="1" colspan="1">51</td><td align="left" rowspan="1" colspan="1">16 to 68</td><td align="left" rowspan="1" colspan="1">32</td><td align="left" rowspan="1" colspan="1">Discharged COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Lopinavir/ Ritonavir<break></break>Oseltamivir<break></break>Arbidol</td><td align="left" rowspan="1" colspan="1">51<break></break>7<break></break>2</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Duration of hospital stay was 9-13 days. 1 patient died.</td></tr><tr><td align="left" rowspan="1" colspan="1">Qin X; 2020; China (21)</td><td align="left" rowspan="1" colspan="1">89</td><td align="left" rowspan="1" colspan="1">23 to 86</td><td align="left" rowspan="1" colspan="1">45</td><td align="left" rowspan="1" colspan="1">All COVID-19 patients admitted to a center</td><td align="left" rowspan="1" colspan="1">Lopinavir/Ritonavir<break></break>Other anti-viral</td><td align="left" rowspan="1" colspan="1">84<break></break>5</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">16 patients were discharged and 1 patient died.</td></tr><tr><td align="left" rowspan="1" colspan="1">Shang J; 2020; China (22)</td><td align="left" rowspan="1" colspan="1">416</td><td align="left" rowspan="1" colspan="1">49 (IQR: 36-61)</td><td align="left" rowspan="1" colspan="1">194</td><td align="left" rowspan="1" colspan="1">Survived and dead COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">380</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Anti-viral administration did not affect mortality rate (5.6% in non-treated vs. 12.9 treated; p=0.288)</td></tr><tr><td align="left" rowspan="1" colspan="1">Wang D; 2020; China (23)</td><td align="left" rowspan="1" colspan="1">138</td><td align="left" rowspan="1" colspan="1">22 to 92</td><td align="left" rowspan="1" colspan="1">75</td><td align="left" rowspan="1" colspan="1">ICU and Non-ICU admitted COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Oseltamivir</td><td align="left" rowspan="1" colspan="1">124</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">6 patients died and 36 patients were admitted to ICU.</td></tr><tr><td align="left" rowspan="1" colspan="1">Wu J; 2020; China (25)</td><td align="left" rowspan="1" colspan="1">80</td><td align="left" rowspan="1" colspan="1">46.10 ± 15.42</td><td align="left" rowspan="1" colspan="1">39</td><td align="left" rowspan="1" colspan="1">All severity ranges of COVID-19</td><td align="left" rowspan="1" colspan="1">Ribavirin</td><td align="left" rowspan="1" colspan="1">80</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">2-12 days</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">21 patients were discharged and 59 patients remained in hospital.</td></tr><tr><td align="left" rowspan="1" colspan="1">Xu X; 2020; China (26)</td><td align="left" rowspan="1" colspan="1">62</td><td align="left" rowspan="1" colspan="1">41 (IQR: 32-52)</td><td align="left" rowspan="1" colspan="1">35</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19</td><td align="left" rowspan="1" colspan="1">Lopinavir/ritonavir<break></break>Arbidol<break></break>Lopinavir/ritonavir + Arbidol</td><td align="left" rowspan="1" colspan="1">25<break></break>1<break></break>21</td><td align="left" rowspan="1" colspan="1">Lopinavir 400 mg twice daily ritonavir 100 mg twice daily<break></break>Arbidol 200 mg three time daily</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">One patient was discharged. Other patients remained in hospital</td></tr><tr><td align="left" rowspan="1" colspan="1">Yang W; 2020; China (27)</td><td align="left" rowspan="1" colspan="1">149</td><td align="left" rowspan="1" colspan="1">45.11 ± 13.35</td><td align="left" rowspan="1" colspan="1">81</td><td align="left" rowspan="1" colspan="1">All COVID-19 patients admitted to a center</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">140</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">No mortality. 73 patients were discharged and 76 remained in hospital.</td></tr><tr><td align="left" rowspan="1" colspan="1">Young BE; 2020; Singapore (28)</td><td align="left" rowspan="1" colspan="1">18</td><td align="left" rowspan="1" colspan="1">31 to 73</td><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19</td><td align="left" rowspan="1" colspan="1">Lopinavir/ritonavir</td><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Two patients recovered and the condition of 2 other patients deteriorated. Only one patient completed the 12-day planned protocol. Four patients experienced side effects of antiviral therapy</td></tr><tr><td align="left" rowspan="1" colspan="1">Zhang G; 2020; China (29)</td><td align="left" rowspan="1" colspan="1">221</td><td align="left" rowspan="1" colspan="1">20 to 96</td><td align="left" rowspan="1" colspan="1">108</td><td align="left" rowspan="1" colspan="1">Non-severe and severe confirmed COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">196</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">12 patients died. Chest CT improved after administration of ECMO and IMV</td></tr><tr><td align="left" rowspan="1" colspan="1">Zhou Z; 2020; China (31)</td><td align="left" rowspan="1" colspan="1">10</td><td align="left" rowspan="1" colspan="1">29 to 68</td><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">Confirmed COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Lopinavir/ritonavir<break></break>Arbidol</td><td align="left" rowspan="1" colspan="1">8<break></break>3</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">1 patient died, 5 patients remained hospitalized and 4 patients were discharged</td></tr><tr><td align="left" rowspan="1" colspan="1">Case reports</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Han X; 2020; China (14)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">23</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">Diabetic patient with COVID-19 </td><td align="left" rowspan="1" colspan="1">Oseltamivir/ Gancivlovire</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">15</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Patient was discharged from hospital after 15 days</td></tr><tr><td align="left" rowspan="1" colspan="1">Li W; 2020; China (17) </td><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">10 months to 6 years</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">Children with COVID-19</td><td align="left" rowspan="1" colspan="1">Not specified</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">The antiviral therapy did not change the outcome or length of stay</td></tr><tr><td align="left" rowspan="1" colspan="1">Lim J; 2020; South Korea (18)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">54</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19 patient</td><td align="left" rowspan="1" colspan="1">Lopinavir/ritonavir</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">75 mg twice a day/50 mg twice daily</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Good recovery. It is not clear that the decreased load of virus is due to the nature of healing process or a result of anti-viral therapy</td></tr><tr><td align="left" rowspan="1" colspan="1">Wang Z; 2020; China (24)</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">19 to 63</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">COVID-19 patients</td><td align="left" rowspan="1" colspan="1">Lopinavir/ritonavir <break></break>Arbidol<break></break>SFJDC</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">400 mg/100 mg twice daily<break></break>0.2 g, three time daily<break></break>2.08 g, three time daily</td><td align="left" rowspan="1" colspan="1">Oral</td><td align="left" rowspan="1" colspan="1">6-16 days</td><td align="left" rowspan="1" colspan="1">Antibiotic</td><td align="left" rowspan="1" colspan="1">2 patients recovered and 2 patients remained in hospital</td></tr><tr><td align="left" rowspan="1" colspan="1">Zhang Z; 2020; China (30)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">38</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">Symptomatic COVID-19 patients</td><td align="left" rowspan="1" colspan="1">oseltamivir and Arbidol</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">NR</td><td align="left" rowspan="1" colspan="1">Yes</td><td align="left" rowspan="1" colspan="1">Both patients recovered and were discharged</td></tr></tbody></table><table-wrap-foot><p>*,Age was reported as range, mean±SD or median (interquartile rang [IQR]). ECMO: extracorporeal membrane oxygenation; IMV: invasive mechanical ventilation; NR: Not reported; ICU: intensive care unit; CT: computed tomography</p></table-wrap-foot></table-wrap><p>As previously mentioned, all of the other studies were case-reports and case-series. Moreover, most of the studies did not provide an analysis regarding the efficacy of antiviral therapy in the treatment course of COVID-19 patients. For instance, Chen et al. reported no deaths among nine patients treated with Lopinavir/Ritonavir. However, the sample size of the mentioned article was quite small (<xref rid="B12" ref-type="bibr">12</xref>). According to the existing statistics, the mortality rate of COVID-19 among patients aged 10 to 60 years, varies between 0.2% and 1.3% (<xref rid="B3" ref-type="bibr">3</xref>). Hence, for every 100 patients in this age group, only one patient dies. Therefore, the sample size was probably not large enough to observe at least one death. In another study, Hu et al. studied 24 asymptomatic patients and reported no mortality or ICU admission, and no serious complication in 21 patients treated with antiviral agents. Nonetheless, in addition to the small sample size, since the patients were asymptomatic, the severity of COVID-19 was rather mild in them. Therefore, the recovery of the patients might have been due to their mild disease, rather than the efficacy of the antiviral drugs used (<xref rid="B15" ref-type="bibr">15</xref>). </p><p>Guan et al. studied 1099 patients, 393 of which were treated with oseltamivir and showed that ICU admission, need for mechanical ventilation, or death rate was 9.2% among the oseltamivir-treated group, whilst the rate was 4.4% in the group that was not treated with oseltamivir. In other words, oseltamivir administration was ineffective in decreasing ICU admission rate, the need for ventilator and death rate among the patients (<xref rid="B13" ref-type="bibr">13</xref>). Shang et al. performed a study on 416 patients, indicating that antiviral drugs have no effects on the mortality rate of COVID-19 patients. In their study, the mortality rate was 12.9% among the group treated with antiviral drugs, whereas the group which did not receive the antiviral treatment had a mortality rate of 5.6% (<xref rid="B22" ref-type="bibr">22</xref>). Furthermore, in Singapore, Young et al. studied 18 patients, and administered lopinavir/ritonavir for only five patients, two of whom recovered and two deteriorated. Only one patient tolerated the antiviral regimen and completed the 12-day treatment course. After the start of antiviral treatments, liver test results became abnormal in three of the patients (<xref rid="B28" ref-type="bibr">28</xref>).</p><p>Also, Li et al. examined five children with COVID-19 (two patients treated with antiviral drugs and three patients did not receive antiviral therapy), indicating that antiviral agents did not change the outcome or the duration of hospital stay (<xref rid="B17" ref-type="bibr">17</xref>). Lim et al. presented a 54-year-old non-smoker woman with no medical history, in whom the viral load started to decline and symptoms started to alleviate gradually with the start of lopinavir/ritonavir treatment, and eventually, the patient was discharged. The researchers reported that it is not clear that the reduced burden of COVID-19 is due to the healing process or to the administration of anti-viral therapy (<xref rid="B18" ref-type="bibr">18</xref>). Furthermore, Han et al. and Zhang et al. reported complete recovery in one patient who had diabetes and was treated with oseltamivir/ganciclovir (<xref rid="B14" ref-type="bibr">14</xref>) and two patients treated with oseltamivir and arbidol (30), respectively.</p><p>There are also studies available that, despite having an acceptable sample size, did not report the final outcome of a large portion of their patients. For instance, Wu et al. did not report any deaths among 80 patients treated with ribavirin, while 59 patients were still not discharged and their outcome was still unclear at the time of the submission of the article (<xref rid="B25" ref-type="bibr">25</xref>). Xu et al. (26), Yang et al. (<xref rid="B27" ref-type="bibr">27</xref>) and Wang et al. (<xref rid="B24" ref-type="bibr">24</xref>) also observed no deaths in their studies. However, the majority of the patients they reviewed were still under treatment, with an unclear final outcome, at the time of the publication of their articles.</p><p><bold>Studies on </bold><bold>SARS-CoV and MERS-CoV</bold></p><p>An extensive search was conducted in databases, in order to find the existing evidence regarding antiviral therapies for treatment of diseases caused by SARS-CoV and MERS-CoV, which are in the same family as SARS-CoV-2. In this section, only clinical trials were supposed to be found. 2004 non-duplicate articles were reviewed, and no clinical trials were performed on the antiviral treatments in managing SARS-CoV and MERS-CoV patients (Figure 1). Only one clinical trial protocol commissioned by a research team in Saudi Arabia existed. This study, named as the MIRACLE trial, was designed to evaluate the efficacy of lopinavir / ritonavir and interferon-β1b combination therapy in the treatment of MERS-CoV patients. The study is currently ongoing, and their results have not been published yet (<xref rid="B32" ref-type="bibr">32</xref>). Therefore, no clinical trials exist on the basis of which an antiviral drug can be suggested for COVID-19, not even for SARS-CoV and MERS-CoV.</p></sec><sec sec-type="discussion"><title>Discussion</title><p>The findings of the present study indicated that only one clinical trial was completed on the efficacy and safety of antiviral agents in management of COVID-19 patients, which showed ineffectiveness of lopinavir-ritonavir in improving patients’ outcomes. Moreover, no clinical trials exist on treatments for SARS-CoV and MERS-CoV. Furthermore, in 2019 and 2020, 21 case-series and case-reports provided reports about antiviral treatments in management of COVID-19 patients, none of which can be taken into account when assessing the clinical usefulness of antiviral treatments against COVID-19. In general, no study has examined the efficacy of antiviral therapies alone in treatment of COVID-19, and all of the existing articles have used other treatments such as antibiotics, immunoglobulin, interferon, glucocorticoids, antifungal and antiparasitic drugs in their studies. Hence, the reports presented cannot be attributed solely to antiviral drugs. Therefore, the existing literature regarding the efficacy of antiviral therapy in management of COVID-19 patients has serious limitations including:</p><p>1. Only one clinical trial has been conducted on the matter, depicting that lopinavir-ritonavir is not superior to the standard treatments in management of COVID-19 patients.</p><p>2. In all of the existing case-series and case-reports, antiviral agents were used in combination with other medications, and therefore the observed outcomes cannot be solely attributed to antiviral therapy.</p><p>3. Since there was no placebo group in the case-series and case-reports, one cannot determine that the outcomes are due to antiviral therapy or the nature of healing process or both.</p><p>4. Follow-up was incomplete in some studies, and a great proportion of the patients have unclear outcomes.</p><p>5. The sample size was small in most of the studies, and some were even case reports.</p><p>Recently, Zhang et al. posted a guideline in the Lancet Respiratory Medicine journal, recommending the administration of Arbidol for management of COVID-19 patients. However, this guideline has limitations. In general, the underlying evidence for this guideline are unclear. Secondly, based on the present systematic review, arbidol was used as the second line of therapy in all of the included studies. Hence, the drug appears to be inappropriate for the first line of therapy (8). Nevertheless, lopinavir-ritonavir being ineffective in management of COVID-19 patients highlights the need to search for other antiviral therapies.</p><p>Many existing guidelines and instructions propose antiviral drugs for management of COVID-19 patients, based on the studies performed on SARS-CoV and MERS-CoV. Therefore, in the current study we aimed to summarize the evidence obtained from clinical trials to determine the level of evidence underlying the mentioned proposal. Surprisingly, no completed clinical trial on SARS-CoV and MERS-CoV was found, and all of the proposals were based on simulation studies, in vitro studies, pre-clinical studies or at best, observational studies and case-series (<xref rid="B33" ref-type="bibr">33</xref>-<xref rid="B38" ref-type="bibr">38</xref>). After an epidemic has subsided, researchers are reluctant to perform further investigations on the matter, which is a major pitfall in research and can have several reasons. The first and most important reason is the decline in the number of patients, which severely limits the possibility of performing a clinical trial. Secondly, the previous two epidemics, namely SARS-CoV and MERS-CoV, never became a pandemic, and the majority of the cases were in a limited geographic region. Therefore, after the suppression of the epidemics and decline in the number of patients, the two diseases were eliminated from the list of priorities of international organizations. If those international organizations, such as the World Health Organization, had further insisted on the importance of the subject and provided grants for independent researches, maybe a few effective antiviral agents for SARS-CoV and MERS-CoV would have existed, which could be helpful in management of COVID-19, decreasing its burden on societies. A lesson should be learned from the COVID-19 pandemic and negligence of health policy makers in setting up clinical trials during SARS-CoV and MERS-CoV epidemics, so that in the current pandemic and future epidemics, researches and well-designed clinical trials are planned-out while the disease is at its peak, the findings of which can be used when necessary.</p></sec><sec sec-type="conclusions"><title>Conclusion</title><p>Findings of the current systematic review indicated that it is not clear whether the currently used antiviral agents are beneficial in improving the outcome of COVID-19 patients or not. One clinical trial and some case-series suggest that these drugs may not have an impact on the final outcome of COVID-19 patients. Furthermore, lack of published clinical trials on SARS-CoV and MERS-CoV, which were epidemics in recent years, impedes suggesting a potential antiviral treatment for COVID-19. The current situation is a serious red flag for international organizations such as the World Health Organization. In the time of the current pandemic and future epidemics, organizations such as WHO should pursue more proactive actions and plan well-designed clinical trials to be able to use the results in managing future pandemics.</p></sec></body><back><ack><title>Acknowledgment</title><p>None.</p></ack><sec><title>Funding</title><p>This study was supported by Shahid Beheshti University of Medical Sciences</p></sec><sec><title>Conflict of interest</title><p>There is no conflict of interest.</p></sec><sec><title>Authors’ contribution</title><p>Study design: SS, MY, MH</p><p>Data gathering: MY, AMN, KMA</p><p>Interpreting the findings: All authors</p><p>Writing the first draft: MY, AMN and SS.</p><p>Critically revised the manuscript: All authors</p></sec><sec><title>Role of the funding source</title><p>Shahid Beheshti University of Medical Science did not has any role in study design, data collection, analysis, interpretation of data, writing of the report; and in the decision to submit the paper 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