Two new omicron subvariants have overtaken BA.5 as the prevailing versions of the coronavirus in the U.S.BA.5 became dominant in July, then consistently accounted for the majority of new Covid infections until last week. The two together make up around 44% of new Covid infections, whereas BA.5 makes up just 30%. BQ.1.1 and BQ.1 cases are also rising in the U.K. and elsewhere in Europe. Both of the subvariants are considered part of the BA.5 family — they're sublineages that evolved from BA.5. "There’s nothing in the signature of the clinical cases that are being reported that suggests that anything is changing in terms of symptoms with these omicron subvariants," Pekosz said.

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