WASHINGTON - Dr. Anthony Fauci says he is "not convinced" COVID-19 developed naturally, and called for an open investigation into the virus' origins."There’s a lot of cloudiness around the origins of COVID-19 still, so I wanted to ask, are you still confident that it developed naturally?" PolitiFact’s Katie Sanders asked the nation’s top infectious disease expert in an event, United Facts of America: A Festival of Fact-Checking event."No actually," Fauci, director of the National Institute of Allergies and Infectious Diseases (NIAID) said, around 12 minutes into footage of the event, which was held earlier this month but overlooked by most media outlets.