Highly contagious Delta variant​ could cause next COVID-19 wave: "This virus will still find you"

Whether it's airports, NBA games, or concerts, crowds are gathering across the nation as Americans start a return to pre-pandemic life.

But with just 45% of Americans fully vaccinated and only 16 states that have fully vaccinated more than half of their populations, health experts are worried about the spread of the highly contagious Delta variant. It is 60% more contagious than the Alpha variant discovered in the U.K., which was the last variant of major concern, according to infectious disease expert Michael Osterholm. "In the areas where they have large pockets of unvaccinated people, we can surely expect to see surges in cases, in some situations challenging the health care capacity of that local area," Osterholm told CBS News' David Begnaud.