XBB.1.5 now represents about 41% of new cases nationwide in the U.S., according to CDC data.

The BQ coronavirus subvariants are likely resistant to key antibody medications used by people with compromised immune systems.

The H3N2 variant has been associated with more severe flu seasons for children and the elderly in the past, according to the CDC.

Omicron subvariants BQ.1 and BQ.1.1 now make up 44% of new Covid cases, compared with 32% last week, according to CDC data.