What causes yellow fever?
Yellow fever is caused by infection with yellow fever virus, which is transmitted by the bite of infected mosquitoes. What can people do to prevent becoming infected with yellow fever virus? Yellow fever can be prevented by vaccination. Travelers should also take precautions against mosquito bites when in areas with yellow fever transmission. Travelers should get vaccinated for yellow fever before visiting areas where yellow fever occurs. In the United States, the vaccine is given only at designated yellow fever vaccination centers. International regulations require proof of yellow fever vaccination for travel to and from certain countries. People who get vaccinated should be given an International Certificate of Vaccination. Avoid mosquito bites when traveling in tropical areas. Mosquitoes that spread yellow fever usually bite during the day, especially at dusk and dawn. • When outside: • Wear long-sleeved clothing and long pants. For extra protection, treat clothing with the insectic
