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These variants are produced through replication errors of the viral genome by viral RNA-dependent RNA polymerase (RdRp). Seasonal epidemics of influenza are also known to occur because of new variants of influenza A virus (IAV), which are generated by the introduction of mutations by viral RdRp with low fidelity. Variants with different antigenicities appear because of mutations in envelope glycoproteins. In this study, we calculated and compared the mutation rates in genome replication of IAV and SARS-CoV-2. Average mutation rates per passage were 9.01\u2009\u00d7\u200910<jats:sup>\u20135<\/jats:sup> and 3.76\u2009\u00d7\u200910<jats:sup>\u20136<\/jats:sup> substitutions\/site for IAV and SARS-CoV-2, respectively. The mutation rate of SARS-CoV-2 was 23.9-fold lower than that of IAV because of the proofreading activity of the SARS-CoV-2 RdRp complex. Our data could be useful in establishing effective countermeasures against COVID-19.<\/jats:p>","DOI":"10.1038\/s41598-023-40463-4","type":"journal-article","created":{"date-parts":[[2023,8,11]],"date-time":"2023-08-11T18:02:23Z","timestamp":1691776943000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Comparison of genome replication fidelity between SARS-CoV-2 and influenza A virus in cell culture"],"prefix":"10.1038","volume":"13","author":[{"given":"Yoshiko","family":"Kawasaki","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haruka","family":"Abe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiro","family":"Yasuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,8,11]]},"reference":[{"key":"40463_CR1","doi-asserted-by":"publisher","first-page":"891","DOI":"10.1016\/j.chom.2020.04.023","volume":"27","author":"Y Wu","year":"2020","unstructured":"Wu, Y. et al. 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