evidence: Some coronaviruses pose a threat to human health, as illustrated by the 2003 SARS outbreak and the COVID-19 pandemic. Among the coronaviruses that have been thoroughly studied is WIV-1, because it can infect humans. However, WIV-1 is only loosely related to SARS-CoV-2, the virus that causes COVID-19, and thus isn’t responsible for the pandemic.