RIODE JANEIRO, BRAZIL - The S project, kept secret until now, will be put into practice by the Butantan Institute and the São Paulo state government.
As of February 17th, the state government will begin mass vaccination in Serrana, a municipality which is part of the Ribeirão Preto metropolitan region, some 300 kilometers north of the capital.
Some 30,000 people will be immunized, representing the municipality's entire adult population. In total, Serrana has just over 43,000 inhabitants.
The announcement will be made by São Paulo State governor João Doria next week, but CNN had . . .