Journal article
Effectiveness and Duration of Protection of a Fourth Dose of Coronavirus Disease 2019 Messenger RNA Vaccine Among Long-term Care Residents in Ontario, Canada
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.
Authors
Grewal R; Nguyen L; Buchan SA; Wilson SE; Costa AP; Kwong JC
Journal
The Journal of Infectious Diseases, Vol. 227, No. 8, pp. 977–980
Publisher
Oxford University Press (OUP)
Publication Date
April 18, 2023
DOI
10.1093/infdis/jiac468
ISSN
0022-1899