COVID-19 vaccines still are saving untold lives, but omicron's easy spread has many wondering if they will need boosters every few months or even a new kind of shot altogether
COVID-19 vaccines still are saving untold lives, but omicron's easy spread has many wondering if they will need boosters every few months or even a new kind of shot altogether
A two-shot course of Pfizer Inc.’s vaccine has just 22.5% efficacy against symptomatic infection with the omicron variant but can thwart severe disease, according to laboratory experiments in South Africa.