São Paulo authorities during the launch of Serrana's mass vaccination project. Photo: Govesp
Between February and April of this year, the 45,000-people municipality of Serrana in the state of São Paulo held a mass vaccination trial. After seeing a massive drop in Covid cases, hospitalizations, and deaths, the city experienced a new wave of infections in October.
According to the city’s latest epidemiological update, however, deaths have remained stable at just three in all of last month.
Experts see the surge in infections as worrisome, indicating the need for booster shots. An article published in Science magazine shows that vaccine protection regardless of the immunizer begins to decrease after roughly six months.
Official data shows that nearly half of jabs rolled out in Serrana used the Chinese-made CoronaVac vaccine. Nationally, the rate of people vaccinated with CoronaVac sits at 29 percent.
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