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In recent months, consideration of the so-called lab leak hypothesis has seemingly gained momentum By Jessica McDonald • NBC Universal, Inc. A year and a half into the COVID-19 pandemic and with a death toll approaching 4 million lives  how the coronavirus came to spark a global scourge remains unknown. Was it the result of a spillover from an animal to a human, as has happened repeatedly in the past? Or did the virus accidentally escape from a nearby lab in Wuhan? The default answer for most scientists has been that the virus, SARS-CoV-2, probably made the jump to humans from bats, if it was a direct spillover or, more likely, through one or more intermediate mammals. That’s what happened with the coronaviruses responsible for SARS and MERS, and such zoonotic events are standard fare for emerging pathogens. 

New yorkUnited statesNew south walesRepublic ofFred hutchinson cancer research centerColumbia universityLoyola universityDavid robertsonKristiang andersenAnthony fauciSusan weissJoe bidenRobertf garryShi zhengliScripp kristian andersenStanley perlman