The early evolution of COVID-19 incidence and mortality among people aged under 80 years or 80 years and above after COVID-19 vaccine implementation in the state of Bahia, Brazil.

This study evaluates the early effects of COVID-19 vaccine implementation in the number of cases and deaths due to COVID-19 among those aged < 80 years or ≥ 80 years in the state of Bahia, Brazil. For that, we used data from the Bahia state Secretary of Health platform of cases and deaths due to COVID-19 in all age groups, between March 2020 and May 2021, when 82% of COVID-19 vaccines were CoronaVac. Overall, there were 1,012,200 cases and 21,241 deaths due to COVID-19, of which, respectively, 2.3% and 25.3% occurred in patients aged ≥ 80 years. The median proportion of deaths in those ≥ 80 years decreased from 29.8% (27.8%-30.4%) in the pre- to 18.8% (15.6%-18.8%) in the post-vaccine periods (p = 0.04). Significant reduction in the median proportion of deaths from COVID-19 among those aged ≥ 80 years after COVID-19 vaccine implementation was found, which suggests CoronaVac effectiveness against death from COVID-19 in the elderly.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Ltd. All rights reserved.)