Case-control study shows waning vaccine protection against COVID-19 mortality in nursing home residents, indicating need for booster doses.
Waning vaccine protection was observed already 90 days after the last vaccine dose among older people living in nursing homes. The reported ORs imply that more than one third of all COVID-19 deaths could in the investigated setting have been possible to prevent by more frequent vaccine boosting during 2022-2023.
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Björk et al. (2025) studied this question.
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