The effectiveness of the AstraZeneca vaccine in older adults during SARS-CoV-2 Gamma variant circulation in São Paulo was 77.9% against symptomatic Covid-19, 87.6% against hospitalization, and 93.6% against death.

Effectiveness of ChAdOx1 vaccine in older adults during SARS-CoV-2 Gamma variant circulation in São Paulo – Nature Medicine

Commentary on Twitter (thread – click for more)

Effectiveness of Oxford-AstraZeneca COVID-19 vaccine by dose in over 60s in São Paulo state, published today in @NatureComms with @juliocroda @otavio_ranzani @datcummings as part of the VEBRA COVID-19 group 1/8https://t.co/zIbPb45nEJ

— Matt Hitchings (@MHitchingsEpi) October 28, 2021