Of those, 137 have died, and more than 900 other cases are under investigation. The vast majority of confirmed cases and deaths have been in the southeastern state of Minas Gerais, which borders the state of Rio de Janeiro.
Death raised alarm
In Casimiro de Abreu, health workers visited houses in rural areas and inspected stagnant water, where mosquitoes lay eggs. The state also sent experts to nearby parks and reserves with monkey populations to monitor the situation with the primates, which are a primary reservoir of yellow fever.
Meanwhile, in a group of houses near a lush jungle area a few miles (5 kilometers) from downtown, relatives of Santos wait for news about the four members of the family who may be infected.
Walace Santos, the younger brother of the man who died, said he took solace in knowing that the death raised alarm bells that could save others.
"Wherever he is now, he knows that because he died a lot of lives were saved," said Santos.