Even if you are not an American citizen, the US government’s CDC website should be your starting point for any consultation on health issues related to your upcoming trip to Brazil. You will find the information under the section Health Information for Brazil.
It contains thorough, reliable and up-to-date information on all health issues, including a section on vaccines and another section on items you might want to bring with you on your trip.
Whenever a new fact emerges the CDC releases a travel notice. On the last few days there have been notices on yellow fever, dengue, H1N1 flu and measles.