pathogen in a way for humans that could enhance its virulence or its transmissibility. >> is this sort of gain of function research, was it happening in wuhan? >> they're working on bats sars like viruses that have never been shown to cause human infection. >> he told "the new york times" my lab has never conducted the gain of function experiments. >> if the wuhan institute was somehow trying to manipulate a virus that occurred in nature to make it even more dangerous. >> the research predicts pandemics in the future. it wasn't to make viruses more dangerous. >> but maybe we're getting too hung up on the strict definition here.