Dr. Anthony Fauci says Americans likely will need to wear masks and stay socially distance to protect themselves from the coronavirus after a vaccine becomes available.

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The US government's leading infectious disease expert tells senators at a hearing that a vaccine won't change conditions overnight. The vaccine availability will go a giant step to controlling the infection, but you're not going to completely eradicate it or eliminate it, Fauci says. It's unusual for a vaccine to be 100% effective, he says. Also, some people are sceptical of vaccinations and may avoid getting a shot. Even if there's enough vaccine available for the entire US population, it will take time to distribute the shots.