A growing number of people, including prominent scientists, are calling for a full retraction of a high-profile study published in the journal Nature in March 2020 that explored the origins of SARS-CoV-2.

The paper, whose authors included immunology and microbiology professor Kristian G. Andersen, declared that evidence clearly showed that SARS-CoV-2 did not originate from a laboratory.

“Our analyses clearly show that SARS-CoV-2 is not a laboratory construct or a purposefully manipulated virus,” the authors wrote in February.