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New study by @MHitchingsEpi et al shows that an inactivated vaccine CoronaVac is effective against COVID-19 in a setting of epidemic P.1 variant transmission in Brazil 🇧🇷. A thread. (1/n)
medrxiv.org/content/10.110…
medrxiv.org/content/10.110…
The authors conducted a matched test-negative case-control study to estimate the effectiveness of an
inactivated vaccine, CoronaVac, in healthcare workers in Manaus, where P.1 accounted for ~75% of the circulating virus.(2/n)
inactivated vaccine, CoronaVac, in healthcare workers in Manaus, where P.1 accounted for ~75% of the circulating virus.(2/n)
Vaccination with at least one dose was associated with an adjusted vaccine effectiveness of 49.6% (95% CI, 11.3 - 71.4) against symptomatic SARSCoV-2 infection >14 days after receiving the first dose. (3/n)
