The problem for the lab-leak position is that the U.S. has never had access to the Wuhan lab and has thus been unable to reach a definitive answer for more than five years. Now that the CIA has at last come to a conclusion, not all scientists are sold on what it has reported, seeing the results as thinly scientifically sourced.

The Central Intelligence Agency has assessed that the COVID-19 pandemic is more likely to have emerged from a lab than from nature, an agency spokesperson said on Saturday. The agency had for years said it could not conclude whether COVID-19 was the result of a lab incident or originated in nature.

The CIA now assesses the virus that causes Covid-19 more likely originated from an accidental lab leak in China, rather than occurring naturally, according to a statement from the agency Saturday, just days after Director John Ratcliffe took the reins.