This is Abbott Northwestern Travel Clinic information about yellow fever.
Yellow fever is transmitted by the bite of infected mosquitoes.
The main risk is to travelers in rural areas of the yellow fever zones of South America and Africa. Transmission in cities is rare except during epidemics. The risk of acquiring yellow fever can be minimized by avoiding mosquito bites and through immunization. For a more detailed description of insect precautions see the health topic insect precautions. Live yellow fever vaccine is given by injection at licensed centers, including Abbott Northwestern Hospital's Travel Clinic.