'I think we'll have to have one more cycle of this virus in the fall, heading into the winter, before we get to a vaccine,' the former FDA chief told CNBC on Wednesday.
told CNBC on Wednesday that it is unlikely there will be widespread deployment of a coronavirus vaccine this year.
"I think we'll have to have one more cycle of this virus in the fall, heading into the winter, before we get to a vaccine," Gottlieb said on "I really think a vaccine is probably a 2021 event, in terms of having wide availability of a vaccine for the general population."could be available in an emergency-use situationBy the end of 2020, vaccine manufacturers will be able to produce the sizable quantities needed to reach tens of millions of people, Gottlieb predicted.
However, he said the issue with widely distributing the potential vaccine this year will be having sufficient data. "You're going to have to test these probably in 30,000-patient clinical trials to have a reasonable data set to tell both safety and effectiveness." He added, "With a virus where 20 to 40% of people develop asymptomatic disease, you have to vaccinate a lot of people to be able to discern whether or not it's working.
"Look, the more effective the vaccine is, the earlier we're going to get a reading on whether or not it's working," stressed Gottlieb, a CNBC contributor who sits on the boards of
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