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Prior infection- and/or vaccine-induced protection against Omicron BA.1, BA.2 and BA.4/BA.5-related hospitalisations in older adults: a test-negative case-control study in Quebec, Canada

2022-12-27 infectious diseases Title + abstract only
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BackgroundDue to severe outcomes, elderly adults 60 years or older are prioritized for COVID-19 vaccination but accumulated SARS-CoV-2 infection and vaccination likely modifies their risk. We estimated vaccine effectiveness against omicron-associated hospitalisation among elderly adults, by number of doses, prior infection history and time since last immunological event. MethodsWe conducted a test-negative case-control study among symptomatic elderly adults tested for SARS-CoV-2 in Quebec, Cana...

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