What should you know about lifetime yellow fever vaccine?

Yellow fever is a mosquito-borne viral infection found in some areas. A vaccine trains the immune system to recognise the virus. For many travellers, one properly recorded vaccination is treated as lasting protection, but a clinician may advise another dose when immune response may be reduced or when a specific destination or authority asks for additional evidence.

The decision is individual. Age, pregnancy, immune-suppressing treatment, certain medical conditions and previous vaccine reactions can change whether vaccination is appropriate. The vaccine is preventive; it does not cure a fever or illness acquired during travel.

Book a travel-health consultation early enough to review your itinerary, departure date, medical history and vaccination record. Use an authorised vaccination centre when travel documentation is needed, and keep the certificate with your passport. Reduce mosquito bites with repellent, covering clothing, screens and suitable accommodation because vaccination does not remove every travel risk.

Seek urgent medical advice for fever, severe headache, jaundice, vomiting, unusual bleeding, confusion or marked weakness during or after travel to an at-risk area. Tell the clinician where you travelled and when. Get prompt help for breathing difficulty, facial swelling or widespread hives after vaccination, as these may signal a serious allergic reaction.

Ask whether your destination requires a certificate, whether your previous dose is acceptable, how your medicines or health conditions affect vaccination, and which mosquito precautions you should use. Ask what symptoms after travel should prompt urgent assessment.