Covid cases will rise in the fall as delta variant spreads, epidemiologist warns - CNBC

"This variant, the delta variant, is 60% more infectious than the alpha variant, so that just shows you, that if you have the same contact with somebody that you had previously who has Covid, and you're not vaccinated, you are at substantial risk of getting infected," Rimoin, a professor of epidemiology at the UCLA School of Public Health, told CNBC's "The News with Shepard Smith.".

 "It's a much more serious game now," Rimoin said.

The delta Covid variant accounts for roughly 1 of 5 new cases in the U.S.