"Anyone who guarantees something when it comes to a vaccine hasn't been involved in developing vaccines, because we know we can't guarantee it. But we can be pretty optimistic that we're on a timeline that we should know by the end of this calendar year, the beginning of 2021, whether we have a safe and effective vaccine."
Renowned infectious disease expert Dr. Anthony Fauci in a video interview with WebMD's Dr. John Whyte as they discuss vaccines, back-to-school plans and the importance of wearing a mask.