CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil – Effectiveness against symptomatic disease was 46.8%, 55.5% against hospitalization, and 61.2% against deaths.

Effectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control study – The BMJ

Editorial: Real world effectiveness of covid-19 vaccines

Related: CoronaVac vaccine: its results are patchy, but the world can’t ignore its usefulness. (several texts on the subject)