Which mosquito causes yellow fever?

A mosquito becomes able to pass on the yellow fever virus after feeding on an infected host. A later bite can transmit the virus to another person. The mosquito involved varies with the setting: urban transmission is associated with Aedes mosquitoes, while forest transmission involves mosquitoes that live and feed in wooded habitats. Yellow fever does not spread through ordinary casual contact with a person who is ill.

Use a suitable insect repellent exactly as directed, cover exposed skin with clothing when practical, and take steps to limit mosquito entry into places where you sleep. Forest visits and daytime outdoor activities can increase opportunities for bites, so protection should not be limited to evening hours. Before travel to a risk area, discuss yellow fever vaccination with a travel-health clinician and share your full itinerary and health history.

Arrange urgent medical assessment for fever after travel in a region with yellow fever risk, particularly alongside severe headache, vomiting, marked fatigue, yellowing of the eyes or skin, bleeding, or confusion. Tell the clinical team about mosquito exposure, travel dates, countries visited, and vaccination status. Prompt assessment helps clinicians consider yellow fever alongside other possible travel-related infections.

Ask whether your planned activities create forest or urban mosquito exposure, which bite-prevention products are appropriate for you, and whether yellow fever vaccination is suitable. Mention skin conditions, pregnancy, medicines, or immune problems that may affect travel planning.