COVID-19

Protection of SARS-CoV-2 Natural Infection Against Reinfection with the Omicron BA.4 or BA.5 Subvariants

Protection of a previous infection against Omicron BA.4/BA.5 reinfection was modest when the previous infection involved a pre-Omicron Alpha or Delta variants, but strong when the previous infection involved the Omicron BA.1 or BA.2 sub-variants.

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Protection of a previous infection against Omicron BA.4/BA.5 reinfection was modest when the previous infection involved a pre-Omicron Alpha or Delta variants, but strong when the previous infection involved the Omicron BA.1 or BA.2 sub-variants.

Protection of a previous infection against BA.4/BA.5 was lower than that against BA.1/BA.2, consistent with BA.4/BA.5’s greater capacity for immune-system evasion than that of BA.1/BA.2.

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