Dr. Fauci Testifies: ‘No Guarantee’ Coronavirus Vaccine Will Be Effective

“I still feel cautiously optimistic that we will have a [vaccine] candidate that will give some degree of efficacy, hopefully a percentage enough that will induce the kind of herd immunity that would give a protection to the population at whole,” said Dr. Anthony Fauci, White House’s top infectious disease expert, at a Senate hearing Tuesday.


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