Protection Conferred by Delta and BA.1/BA.2 Infection Against BA.4/BA.5 Infection and Hospitalization: A Retrospective Cohort Study.

Nicole E Winchester,Nabin K Shrestha,Priscilla Kim,Larisa G Tereshchenko,Michael B Rothberg

The Journal of infectious diseases（2023）

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摘要

Prior infection with BA.1/BA.2 and up-to-date vaccination provided modest protection against infection with BA.4/BA.5 and hospitalization, while prior Delta infection provided minimal protection against hospitalization and none against infection.

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关键词

BA5,COVID-19,SARS-CoV-2,epidemiology,immunity,vaccine effectiveness

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