Yellow Fever Certificates
International Vaccination Certificates
Your travel medicine provider will issue you an International Vaccination book as a record of your yellow fever vaccination.
You should store this vaccination book safely with your passport. The Yellow Fever certificate is valid for life for most persons vaccinated.
(Those vaccinated as children or with immunosuppressive disorders should speak to their travel doctor.)
WHO report here dated May 2014.
If you have lost your Yellow Fever Certificate click here.