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Brazil will vaccinate an entire city's adult population to test the effect on Covid-19 infection rat

(CNN)Brazil's Butantan Institute kicked off a campaign on Wednesday to vaccinate all of the adult population of a city to see if it's possible to reduce the number of cases.

The study will involve the city of Serrana, in the southeastern State of Sao Paulo, the research institute said

"The entire adult population, estimated at 30,000 people, will be immunized in three months, in an unprecedented action," the Butantan Institute wrote via Twitter on Wednesday.

The idea to vaccinate the largest number of people will allow researchers to "follow the evolution of the epidemic. It has technical aspects that will make it possible to make calculations, make projections and calculate whether the vaccine is capable of reducing the transmission of the virus, " said Dimas Tadeu Covas, the director of the institute.

With a population of approximately 45,000, the city of Serrana has been split into four color-coded regions. According to the Butantan Institute, all persons above the age of 18 will be given the Coronavac vaccine, with the exception of pregnant or breastfeeding women and those with severe illnesses.

"Based on what we are going to learn here, we will be able to tell the rest of the world what the actual effect of the vaccination against Covid-19 is," Ricardo Palacios, director of clinical studies at Butantan, said.

Since it started, Brazil has been struck hard by the pandemic and is approaching a record of 10 million cases of Covid-19. After the US — 242,090 according to Johns Hopkins University — the country actually has the most coronavirus-related deaths in the world and ranks seventh in the world for incidents.

Dr. Carissa Etienne, Director of the Pan American Health Organization, said on Wednesday that there are rays of hope. "After many weeks of increases in Covid cases and deaths, we are starting to see improving trends in some of the more heavily affected countries, including the US and Brazil," she said during a weekly online briefing.

She warned, though, that those trends are "cause for hope, but not for celebration."

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