Dr. Anthony Fauci, the nation's top infectious disease expert, said there's "no guarantee" the US will develop a "safe and effective" Covid-19 vaccine — but experts are hopeful.
"It's extremely important to have safe and effective vaccines available for everyone in this country," Fauci said in his opening remarks before a Senate committee today.
But he noted that, "there is no guarantee — and anyone who has been involved in vaccinations will tell you — we'll have a safe and effective vaccine."
"But we are cautiously optimistic, looking at animal data and the preliminary data, that we will at least know the extent of the efficacy sometime in the winter and early part of next year," he continued.
He said experts are "aspirationally hopeful" there could be doses available to the public by next year.