[Preprint] Test-negative case-control study: Effectiveness of CoronaVac vaccine in older people during SARS-CoV-2 Gamma variant transmission in Brazil – Adjusted vaccine effectiveness was 41.6% for symptomatic Covid-19, 59.0% against hospitalizations and 71.4% against deaths.

Effectiveness of the CoronaVac vaccine in the elderly population during a Gamma variant-associated epidemic of COVID-19 in Brazil: A test-negative case-control study – medRxiv

Commentary on Twitter (thread – click for more)

Two new results on vaccine effectiveness of #CoronaVac and #AstraZeneca in #Brazil w/ @otavio_ranzani @juliocroda @datcummings Albert Ko, Jason Andrews and othershttps://t.co/grIg1ydMK6https://t.co/fGmDsi7NdL 1/8

— Matt Hitchings (@MHitchingsEpi) July 23, 2021