Daily archives: 8. December 2022

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Effectiveness of a Fourth Dose

Ramandip Grewal, Sophie A. Kitchen, Lena Nguyen, Sarah A. Buchan, Sarah E. Wilson, Andrew P. Costa,Jeffrey C. Kwong: Effectiveness of a Fourth Dose of COVID-19 Vaccine among Long-Term Care Residents in Ontario, Canada: Test-Negative Design Study, in: medRxiv (June 1, 2022) 32 pages, online in: https://doi.org/10.1101/2022.04.15.22273846. Abstract Background: As of December 30, 2021, Ontario long-term care (LTC) residents who received a third dose of COVID-19 vaccine ≥84 days previously were offered a fourth dose to prevent a surge in COVID-19-related morbidity and mortality due to the Omicron variant. Methods: The authors used a test-negative design and linked databases to estimate […]