The vaccine has not changed, but all countries were granted until 11/7/2016 to adjust their administrative systems accordingly. Travellers in possession of an old vaccination certificate (“yellow booklet“) do not have to apply for a new booklet and the certificate does not need to be amended either.
However, in some specific cases it is not certain whether the vaccine offers lifelong protection and a booster injection can be necessary.
The vaccination certificate is valid for 1 year and a single booster is required before the next trip (when any situation described below has passed) for:
Testing for neutralising antibodies in the blood or repeat vaccination after 10 years is necessary for:
People with reduced immunity:
People with an increased risk: