Bivalent COVID Vaccines
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The bivalent boosters (with half BA.4/BA.5 and half ancestral variant) were designed to produce antibodies and immune memory to Omicron, and have demonstrated pan-Omicron efficacy as shown in studies just released over the last few days.
Keep in mind that Pfizer and Moderna had already performed human trials in a bivalent booster with BA.1, which demonstrated both safety and efficacy. The US government asked them to…