Effectiveness of mRNA COVID-19 monovalent and bivalent vaccine booster doses against Omicron severe outcomes among adults aged >=50 years in Ontario, Canada https://www.medrxiv.org/content/10.1101/2023.04.11.23288403
Effectiveness of mRNA COVID-19 monovalent and bivalent vaccine booster doses against Omicron severe outcomes among adults aged >=50 years in Ontario, Canada https://www.medrxiv.org/content/10.1101/2023.04.11.23288403