RIO DE JANEIRO — As the coronavirus tore through Brazil, President Jair Bolsonaro came under blistering criticism for sabotaging the isolation measures imposed by states, encouraging mass rallies by his supporters and lashing out on the soaring death toll, saying, “What do you want me to do?” Now that the outbreak in Brazil has gotten even worse — with more infections than any country but the United States — Mr. Bolsonaro’s government has come up with a unique response to the growing alarm: It decided to stop reporting the cumulative toll of the virus altogether. Brazil’s health ministry took down...