Please check the Outbreaks section for updates on these and other countries. Currently, there is increased yellow fever activity in Brazil in the states of Minas Gerais, Rondonia, Goias, and Bahaia. Information World Health Organization Disease Outbreak News Food and waterborne diseases are the number one cause of illness in travelers. Travelers' diarrhea can be caused by viruses, bacteria, or parasites, which are found universally throughout the region and can contaminate food or water.
Malaria is a preventable infection that can be fatal if left untreated.
Malaria risk in this region exists in some urban and many rural areas, depending on elevation. For additional information on malaria risk and prevention, see Malaria Information for Travelers to Tropical South America . A certificate of yellow fever vaccination may be required for entry into certain of these countries. For detailed information, see Comprehensive Yellow Fever Vaccination Requirements . If you visit the Andes Mountains, ascend gradually to allow time for your body to adjust to the high altitude, which can cause insomnia, headaches, nausea, and altitude sickness.