What should you know about an outbreak of yellow fever?

Yellow fever is a viral infection spread by the bite of an infected mosquito. Early illness may include fever, headache, muscle aches, nausea and vomiting. Some people then develop severe illness affecting the liver or other organs, with jaundice, bleeding, confusion or reduced urine.

An outbreak is a public-health warning about transmission in a particular place or population. Risk depends on where mosquitoes and virus are present, your travel route, and whether you have suitable protection.

Before travel to an affected or at-risk area, ask a travel-health clinician whether Yellow Fever Vaccination is recommended or required for your itinerary. Discuss pregnancy, immune problems, allergies and age because these can affect vaccine decisions.

Reduce bites by using an appropriate insect repellent, wearing long sleeves and trousers, choosing screened or air-conditioned rooms, and removing standing water where practical. Follow current local health advice during an outbreak.

Seek urgent medical assessment for fever after travel to an affected area, particularly with yellowing of the eyes or skin, bleeding, severe vomiting, confusion, extreme weakness or reduced urine. Tell clinicians about travel dates, mosquito exposure and vaccination history.

Do not wait for a rash or jaundice before asking for advice. Several infections can resemble yellow fever, and early assessment helps determine testing, monitoring and infection-control steps.

Ask whether your destination carries risk, how far in advance vaccination should be discussed, and which bite-prevention measures suit your medicines or skin. Ask what symptoms after travel should trigger immediate care.