Newly Released Documents Show NIH Funded Gain-of-Function Research in China: Experts

This aerial view shows the P4 laboratory (C) on the campus of the Wuhan Institute of Virology in Wuhan in China's central Hubei Province on May 27, 2020. Hector Retamal/AFP via Getty Images

The U.S. National Institutes of Health (NIH) funded research in China that created a more potent form of a bat coronavirus, according to newly disclosed documents.

An experiment conducted at the Wuhan Institute of Virology, situated near where the first cases of COVID-19 were reported, compared mice infected with the original bat coronavirus to mice infected with a modified strain created by researchers, according to the documents.