Source: REUTERS/Denis Balibouse

Gates has repeatedly warned against a full return to normality until a vaccine is available for the general population.

"It'll be semi-normal until that vaccine is out there in billions of doses," he said. And a vaccine is still, at least, 18 months away. "Until you've got that vaccine widely used, life will still not be back to normal."

There are some things, he said, that are unlikely to ever return to normal.

"There are a few things, like business trips, that I doubt will ever go back," he said. It's simply a measure of necessity and risk, according to Gates.

"In the case of high school, I think the social activity - making friends, hanging out - that you get by being there physically, that's totally irreplaceable," he said.

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