To determine the effectiveness of vaccination against SARS-CoV-2 in preventing illness and death from COVID-19 in Córdoba, Argentina, during the period from January through June 2021.
A retrospective cohort study was conducted among 1 139 458 residents of the province of Córdoba. Multiple logistic regression models were developed to describe the relationship between vaccination and the presence of SARS-CoV-2 or death from COVID-19, while taking account of comorbidities and chronic disease risk factors and adjusting for sex and age.
Among the general population, having received one or two doses of vaccine reduced the risk of illness by 98.8% and 99.3%, respectively, and the risk of dying by 83% and 96.5%, respectively. Among those who developed COVID-19, the probability of dying was reduced by 57% and 80%, respectively. Regarding the probability of death, the risk increased with age, with being male, and with obesity, arterial hypertension, and diabetes mellitus.
Vaccination is effective and protects against the risk of getting COVID-19, developing severe disease, or dying. Having obesity, arterial hypertension, or diabetes mellitus, in descending order, increases the risk of death.