Further clarification on the recommendations for the use of Yellow Fever Vaccination in the light of the WHO SAGE statement that protection from a single dose of yellow fever vaccine is life-long.
1. At present a number of countries require a valid International Certificate of Vaccination or Prophylaxis (ICVP) as a condition of entry for all travellers.
Other countries require an ICVP as a condition of entry only for travellers arriving from countries with risk of yellow fever transmission and/or for travellers having transited through the airport of a country with risk of yellow fever (YF) transmission.
There is no change to the advice regarding travellers who require an ICVP for IHR purposes as a condition of entry into a country. They continue to require an up-to-date ICVP (or letter of exemption on medical grounds), based on their individual risk assessment.
This may change in the future, depending on the outcome of discussions between WHO and the countries concerned.
2. For travellers to countries where yellow fever is present and the traveller is at risk of the disease, based on their individual risk assessment, the traveller should be vaccinated if they have had no previous yellow fever vaccination.
3. Travellers who have previously been vaccinated against yellow fever, regardless of the time elapsed since receiving the vaccine do not normally require a booster dose unless an ICVP is required as a condition of entry. However, a risk assessment must be carried out for each traveller, as there may be circumstances where re-vaccination may be indicated.