Entry visas for Brazil are not required for short tourism and business trips by citizens of most countries in South and Central America, and Europe, as well as nationals from South Africa, Singapore, Israel, Morocco, Mexico, Mongolia and several other countries. Citizens from Mercosul countries may enter Brazil with a recent official identification document from their home country in lieu of a passport. Entry visas for visiting Brazil are currently required from citizens from Australia, Canada, Haiti, the United States of America, most countries in Africa, Asia and Oceania, and several other countries. A complete list of nationalities that need visas is available from this link. You can also find the list of the nationals who can obtain an e-visa.
http://www.portalconsular.itamaraty.gov.br/vistos-para-viajar-ao-brasil#precisa

Each participant is supposed to make their own arrangements for obtaining Brazilian entry clearance if necessary. In case of doubt please contact the nearest Brazilian consulate. (For a list of the consulates and their contact information look at the following web page.)
http://www.portalconsular.itamaraty.gov.br/rede-consular
 

How to apply for a Brazilian visa:

These are the general rules. If you do need a visa please contact the nearest Brazilian consulate. You need to submit a visa application through this website.
https://formulario-mre.serpro.gov.br/sci/pages/web/pacomPasesWeb.jsf

Your passport must be valid for at least six months after your arrival date in Brazil.

In case the Brazilian authorities request letters of invitation from the organizers of the Meeting please let us know (sending an e-mail to: simcara@icmc.usp.br). We shall send you the necessary letter.

 

Vaccinations recommendations for international travelers:

The common vaccines are needed here as elsewhere. There is no yellow fever epidemic in São Carlos nevertheless a vaccination against it is recommended for international visitors, especially if you are planning to travel around Brazil before or after the meeting.