A rising Covid subvariant soon to become dominant across the US makes the updated bivalent vaccines significantly weaker, according to a study.The BQ.1.1 strain - a descendent of BA.5 and the original variant - already makes up a third of cases nationwide and is out-competing all other versions of the virus, suggesting it has an evolutionary edge.Researchers from the University of tested the new strain against and 's new bivalent shots - designed to target the original Omicron - to see if the new variant spreads so quickly because it can duck vaccines.
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