**3. Results**

A total of 313,328 elderly people (88.4% of the total population > 75 years) had received at least one dose of a vaccine, 44.5% from Oxford-AstraZeneca/Fiocruz and 55.5% from CoronaVac. A total of 159,970 had received two doses, 83.0% from CoronaVac-Sinovac/Butantan and 17.0% from Oxford-AstraZeneca/Fiocruz. The occurrence of deaths among the unvaccinated elderly was more than 132 times higher, as compared to those who had received two doses of a vaccine, with a protection ratio for deaths of 99.2%. After a single dose of a vaccine, the protection ratio was 19.3 (Table 1). The effect was more pronounced with increasing age.


#### *Trop. Med. Infect. Dis.* **2021**, *6*, 129

**Table 1.** Protection ratios for death and percentage attributable protection ratios for deaths by COVID-19, stratified by number of doses applied, vaccine type and age
