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The ancestral form of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that emerged from China has now been largely replaced by strains containing the mutation D614G (Asp\n                    <jats:sup>614<\/jats:sup>\n                    -to-Gly) in the viral spike protein. Hou\n                    <jats:italic>et al.<\/jats:italic>\n                    compared the characteristics of the new variant against the ancestral form in a series of experiments in human cells and animal models. The variant is better at infecting upper-airway epithelial cells and replicates in greater numbers than the ancestral virus. Evidence indicates modest, if any, significant changes to virulence in animal models. Therefore, the virus appears to have evolved for greater transmissibility in humans rather than for greater pathogenicity. The mutation renders the new virus variant more susceptible to neutralizing antisera without altering the efficacy of vaccine candidates currently under development.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:italic>Science<\/jats:italic>\n                    , this issue p.\n                    <jats:related-article xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"doi\" issue=\"6523\" page=\"1464\" related-article-type=\"in-this-issue\" vol=\"370\" xlink:href=\"10.1126\/science.abe8499\">1464<\/jats:related-article>\n                  <\/jats:p>","DOI":"10.1126\/science.abe8499","type":"journal-article","created":{"date-parts":[[2020,11,12]],"date-time":"2020-11-12T19:05:14Z","timestamp":1605207914000},"page":"1464-1468","source":"Crossref","is-referenced-by-count":864,"title":["SARS-CoV-2 D614G variant exhibits efficient replication ex vivo and transmission in vivo"],"prefix":"10.1126","volume":"370","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8323-7243","authenticated-orcid":true,"given":"Yixuan J.","family":"Hou","sequence":"first","affiliation":[{"name":"Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0415-6013","authenticated-orcid":true,"given":"Shiho","family":"Chiba","sequence":"additional","affiliation":[{"name":"Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1648-1625","authenticated-orcid":true,"given":"Peter","family":"Halfmann","sequence":"additional","affiliation":[{"name":"Influenza Research Institute, Department of Pathobiological Sciences, School of Veterinary Medicine, University of 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