Vaccine protection against COVID-19 mortality in relation to time since last booster dose among nursing home residents in Sweden - A case-control study over 35 months
BACKGROUND: The implementation of COVID-19 vaccination among older persons at nursing homes has lowered the infection-associated mortality considerably, but emerging virus variants and decline in vaccine-induced immunity over time necessitate examination of future booster dosing strategies. The overall aim of this study was to assess vaccine protection against COVID-19 mortality in relation to tim
