RIO DE JANEIRO, BRAZIL - Approximately 1.64 million people in the city of São Paulo - 13.9 percent of the total population - have already been infected with the novel coronavirus. This is the result of the fifth stage of the serological survey conducted by the City Hall, which tested 5,700 adults throughout the city.
The study showed that contamination is six times higher among the poorest than among the wealthiest. Among classes D and E, the percentage of infection reached 18.7 percent and, in classes A and B, it stood at 3.1 percent. Infection is also . . .