Birx Says Coronavirus Vaccine Possible by January as Countries See Largest Single-Day Jumps

"And so, on paper it's possible," Birx said. "It's whether we can execute and execute around the globe, because you also, for phase three, have to have active viral transmission in a community in order to study its efficacy." Birx said that it could be possible if scientists don't rely on one single vaccine. "The way that it's possible is if you bring forward five or six different classes of candidates, which the Operation Warp Speed has done," she added, referring to the Trump administration's vaccine program. USNews