Statements in the past weeks from vaccine manufacturers maintain that the bivalent booster is better than the original booster at increasing antibodies. The booster’s efficacy in people had not been studied before the booster was approved by the FDA, though animal studies have found it generates better protection against widely circulating omicron variants.
The current COVID booster contains two versions of the virus’s spike protein: one from the original virus (now extinct) and another from the BA5 omicron variant, which was dominant in the United States earlier this fall.
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