Only SARS was studied at BSL-4. Bat coronaviruses were studied at BSL-2 as they were not believed to be dangerous to humans. Reference: the head of the WIV cov

Only SARS was studied at BSL-4. Bat coronaviruses were studied at BSL-2 as they were not believed to be dangerous to humans. Reference: the head of the WIV covid lab. https://news.yahoo.com/chinas-bat-woman-center-pandemic-181409897.html https://news.yahoo.com/chinas-bat-woman-center-pandemic-1814... “ Shi said that bat viruses in China could be studied in BSL-2 labs because there was no evidence that they directly infected humans, a view supported by some other scientists.”