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that carried covid-19 that could have been source of the transmission to humans thus far? thus far, not. at what point in time would it become more likely it came from the lab if we don t find an intermediate animal host? how much longer? i don t think we can give a time element on that, senator, for the simple reason we still have not yet confirmed what the host is from ebola. we know that ebola jumps from an animal reservoir to human, and it s been many years now since the original ebola outbreak, so we haven t yet nailed that. reporter: but fauci saying he supports an investigation into the origins of covid. as i ve said, i still believe that the most likely scenario was that this was a natural occurrence, but no one knows that 100% for sure, and since no one absolutely knows that, i believe we do need the kind of investigation where there s open transparency. reporter: in march, the world health organization determined it was unlikely the virus emerged from a lab.