Effectiveness of a fourth dose of covid-19 mRNA vaccine against the omicron variant among long term care residents in Ontario, Canada: test negative design study
OBJECTIVES: To estimate the marginal effectiveness of a fourth versus third dose and the vaccine effectiveness of mRNA covid-19 vaccines BNT162b2 and mRNA-1273 against any infection, symptomatic infection, and severe outcomes (hospital admission or death) related to the omicron variant. DESIGN: Test...
Main Authors: | , , , , , , |
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Format: | Article |
Language: | English |
Published: |
NLM (Medline)
2022
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Online Access: | View Fulltext in Publisher |