New COVID variant is spreading across the US. Here’s what you need to know about BA.2

“I’m more worried that the sheer biomass of virus in these places that are now experiencing major waves of omicron will lead to the emergence of new strains, of which we in the U.S. have not yet experienced,” said Daniel Parker, [assistant professor of public health], an infectious disease expert at the University of California, Irvine. “That could certainly lead to spikes in cases like what we saw with delta and omicron.”