What should you know about port health organization yellow fever injection?

Yellow fever is an infection spread by mosquitoes in parts of Africa and South America. Vaccination helps prepare the immune system before possible exposure. A port health organisation or travel clinic may provide the injection and issue or verify an international vaccination certificate when required. Entry rules depend on your itinerary, transit points and health regulations, so a general travel search may not answer your specific situation. Review the [Yellow Fever Vaccination](/treatments/preventive-care-and-vaccination/yellow-fever-vaccination/) guidance with a qualified provider.

Arrange a travel-health appointment well before departure. Take your passport, itinerary, previous vaccination record and details of any medical conditions or medicines. Tell the clinician about pregnancy, immune problems, severe allergies and previous vaccine reactions. Ask whether your destination or a transit stop creates a vaccination or certificate requirement. Continue mosquito-bite protection with covered clothing, repellent and screened accommodation, because vaccination does not replace protection from bites.

After vaccination, seek urgent help for breathing difficulty, facial swelling, collapse or widespread hives. Contact a clinician for persistent high fever, severe weakness, confusion or yellowing of the eyes after travel to an area where yellow fever occurs. Tell the provider about your travel dates and vaccination history.

Ask whether the vaccine is advised for every destination on your route, when your certificate becomes valid, whether a medical precaution applies, and which mosquito precautions to use.