Not all experts agree.
Professor Richard Ebright of Rutgers University’s Waksman Institute of Microbiology, a biosecurity expert who has been
speaking out on lab safety since the early 2000s, does agree with the
Nature Medicine authors’ argument that the new coronavirus wasn’t purposefully manipulated by humans, calling their arguments on this score strong. Ebright helped
The Washington Post debunk
a claim that the COVID-19 outbreak can somehow be tied to bioweapons activity, a conspiracy theory that’s been
promoted or endorsed by the likes of US Sen. Tom Cotton, Iran’s supreme leader, a high-ranking Chinese government official, and others.
But Ebright thinks that it is possible the COVID-19 pandemic started as an accidental release from a laboratory such as one of the two in Wuhan that are known to have been studying bat coronaviruses.
Except for SARS-CoV and MERS-CoV, two deadly viruses that have caused outbreaks in the past, coronaviruses have been studied at laboratories that are labelled as operating at a moderate biosafety level known as BSL-2, Ebright says. And, he says, bat coronaviruses have been studied at such labs in and around Wuhan, China, where the new coronavirus first emerged. “As a result,” Ebright says, “bat coronaviruses at Wuhan [Center for Disease Control] and Wuhan Institute of Virology routinely were collected and studied at BSL-2, which provides only minimal protections against infection of lab workers.”
Higher safety-level labs would be appropriate for a virus with the characteristics of the new coronavirus causing the current pandemic. “Virus collection, culture, isolation, or animal infection at BSL-2 with a virus having the transmission characteristics of the outbreak virus would pose substantial risk of infection of a lab worker, and from the lab worker, the public,” Ebright says.
Ebright points out that scientists in Wuhan have collected and publicized a bat coronavirus called RaTG13, one that is 96 percent genetically similar to SARS-CoV-2. The
Nature Medicine authors are arguing “against the hypothesis that the published, lab-collected, lab-stored bat coronavirus RaTG13 could be a proximal progenitor of the outbreak virus.” But, Ebright says, the authors relied on assumptions about when the viral ancestor of SARS-CoV-2 jumped to humans; how fast it evolved before that; how fast it evolved as it adapted to humans; and the possibility that that the virus may have mutated in cell cultures or experimental animals inside a lab.
The
Nature Medicine authors “leave us where we were before: with a basis to rule out [a coronavirus that is] a lab construct, but no basis to rule out a lab accident,” Ebright says.