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Brazilian model vaccination program reduced severe cases of COVID-19 and deaths

Publicado em 22 dezembro 2022
A study conducted in Serrana, a small town in São Paulo state used as a model for COVID-19 vaccination in Brazil, shows that mass vaccination reduced the severe case and death rates even while the gamma and delta variants were circulating. Gamma and delta were considered alarming because they spread so much faster than previous variants. Based on an analysis of the virus’s evolutionary history (phylogeny), the researchers showed that the dynamics of SARS-CoV-2 substitution in [...]