Vaccines and medication are not always necessary when traveling to Brazil but can be an important precaution to take. When I traveled to Brazil I knew I would be staying there for a year so it was recommended to me that I get vaccinated for Yellow Fever and Typhoid and I was given Malaria medication to take with me. For short visits, all these vaccinations may be overkill but it depends on which region of Brazil you will be visiting. Malaria is a huge concern in Brazil so do your research before you go and make an informed decision. https://wwwnc.cdc.gov/travel/destinations/clinician/none/brazil