Dr. Anthony Fauci, the nation’s top infectious diseases expert, testified before a House subcommittee on Friday, saying he was “cautiously optimistic” that we could have a vaccine by late fall or early winter.

“We hope at the time we get into the late fall and early winter, we will have in fact a vaccine that we can say will be safe and effective. One can never guarantee the safety and effectiveness unless you do the trial but we are cautiously optimistic,” Fauci said.

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