Its MANDATORY:

For those who within 90 days before entering Brazil visited  any of the following countries: 
Angola, Benin, Bissau Guinea, Bolivia, Burkina Faso, Burundi, Cabo Verde, Camerun, Central African Republic, Colombia, Congo, Democratic Republic of Congo, Ecuador, Equatorial Guinea, Ethiopia, French Guiana, Gabon, Gambia, Ghana, Guiana, Guinea, Ivory Coast, Kenia, Liberia, Mali, Mauritania, Niger, Nigeria, Panama, Peru, Rwanda, Sao Tome & Principe, Senegal, Sierra Leone, Somalia, Sudan, Surinam, Tanzania, Togo, Trinidad and Tobago, Uganda or Venezuela

Its ADVISABLE: 

If your destination in Brazil includes rural areas in any of the following States: 
Acre, Amapá, Amazonas, Federal District, Goiás, Maranhão, Mato Grosso, Mato Grosso do Sul, Pará, Rondônia, Roraima, Tocantins.

For more information send an e-mail to: visas@brazilconsulatechicago.org or
Visit our website: www.brazilconsulatechicago.org