Infectious Diseases A-Z: Yellow fever outbreak

Travelers heading to certain areas of Brazil are recommended by the Centers for Disease Control and Prevention (CDC) to get a yellow fever vaccine at least 10 days before travel. "Currently, there are concerns regarding quite a large outbreak in Brazil that has been linked to yellow fever," says Dr. Nipunie Rajapakse, a pediatric infectious diseases specialist at Mayo Clinic. Yellow fever is a viral infection that is spread by mosquitoes.