Effectiveness and Duration of Protection of a Fourth Dose of Coronavirus Disease 2019 Messenger RNA Vaccine Among Long-term Care Residents in Ontario, Canada.
retrospective_cohort · Level III
Where this comes from
- Record sourced from PubMed, PMID 36461711.
- Also identified by DOI 10.1093/infdis/jiac468.
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Abstract
We estimated the effectiveness of a fourth dose of messenger RNA coronavirus disease 2019 vaccine against Omicron infections and severe outcomes over time among long-term care residents in Ontario, Canada. Fourth doses provide additional protection against Omicron-related outcomes, but the protection wanes over time, with more waning seen against infection than severe outcomes.
Medical subject headings
- COVID-19 Vaccines
- COVID-19