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The EG.5.1 variant of severe acute respiratory syndrome coronavirus‐2 (SARS‐CoV‐2) has been prevalent since mid‐July 2023 in the United States and China. The variant BA.2.86 has become a major concern because it is 34 mutations away from the parental variant BA.2 and >30 mutations from XBB.1.5. There is an urgent need to evaluate whether the immunity of the population and current vaccines are protective...