There is now good evidence to suggest that the new, bivalent boosters from Moderna and Pfizer cut infection risk by half from the so-called "Kraken variant" of Omicron, XBB.1.5.There was much hemming and hawing in the late fall and early winter about early studies that cast doubt on whether the updated, bivalent booster shots that many of us got in recent months were effective at all against the rising, extra-extra-contagious strain of COVID-19 the XBB.1.5
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