, maybe "up to a year," former Food and Drug Administration Commissioner Dr. Scott Gottlieb said.

White House health advisor Dr. Anthony Fauci said Tuesday he worries about the durability of a potential coronavirus vaccine, saying there's a chance it may not provide long-term immunity.

The immunity's not going to be long term in the form of a smallpox vaccine or a polio vaccine where you get the vaccine once and you're protected for the rest of your life or most of your life.