[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)

https://twitter.com/MHitchingsEpi/status/1418599162795360260