This study uses a prospective cohort of essential and frontline workers in 6 US states with SARS-CoV-2 infection to examine associations between 2 or 3 doses of
Protection with a Third Dose of mRNA Vaccine against SARS-CoV-2 Variants in Frontline Workers nejm.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nejm.org Daily Mail and Mail on Sunday newspapers.