Fauci: 'Something very strange' about COVID

"I have not seen anything where you have a virus that in 40% of the people has no symptoms, and those who have symptoms, 80% of them have very mild to moderate symptoms that don't require any significant medical intervention. And then you have 20-25% of people who are devastated," Fauci told The Center for Strategic and International Studies' (CSIS) Senior Vice President Stephen Morrison on Monday.

"There's something very strange about a virus that in most people barely bothers them, and in others it kills them. We still don't know why that's the case right now. We need to find that out," he added.

Fauci's remarks came after some of the first U.S. healthcare workers received doses of the coronavirus vaccine and as the death toll in the U.S. crossed 300,000.