As Petrovsky considered whether SARS-CoV-2 may have emerged in lab cultures with human cells, or cells engineered to express the human ACE2 protein, a letter penned by 27 scientists appeared suddenly on Feb. 19 in the prestigious medical journal The Lancet. The authors insisted that SARS-CoV-2 had a natural origin, and they condemned any alternate hypotheses as conspiracy theories that create only “fear, rumors, and prejudice.”
Petrovksy says he found the letter infuriating. Conspiracy theorists is “the last thing we were, and it looked to be pointing at people like us,” he says.
Last month, a team of international scientists completed a month-long visit to Wuhan to investigate SARS-CoV-2’s origins. Convened by the WHO, and closely monitored by Chinese authorities, the team concluded initially that a lab leak was so unlikely that further investigations of it were unnecessary. The WHO’s director general later walked that statement back, claiming that “all hypotheses remain open and require further analysis and studies.” A group of 26 scientists, social scientists, and science communicators — Petrovksy among them — have now signed their own letter arguing that WHO investigators lacked “the mandate, the independence, or the necessary accesses” to determine whether or not SARS-CoV-2 could have been the result of a laboratory incident.