Effectiveness of BNT162b2 and mRNA-1273 covid-19 vaccines against symptomatic SARS-CoV-2 infection and severe covid-19 outcomes in Ontario, Canada: test negative design study.
BMJ. 2021 Aug 20;374:n1943. doi: 10.1136/bmj.n1943.
BMJ. 2021.
PMID: 34417165
Free PMC article.