Yellow Fever is a vaccine preventable disease. Vaccination is recommended for persons over 9 months of age travelling to or living in endemic areas. The vaccine affords long term protection. The World Health Organization announced that as of 11 July 2016, existing and new Yellow Fever vaccination certificates are valid for life starting 10 days after vaccination. Countries can no longer require travellers to show proof of re-vaccination or a booster dose as a condition of entry. Travellers should note that this new regulation may not be honoured by all border authorities during the transition phase.
Vaccination precautions: If travel to an endemic area cannot be delayed or avoided, the following travellers should get vaccinated depending on a risk assessment of Yellow Fever infection at their destination and a country's entry requirement: Children between the ages of 6 to 8 months, persons over 60 years, those with asymptomatic HIV, pregnant or breastfeeding women.
Vaccination contraindications: Children under 6 months of age, persons with immune deficiencies or on immunosuppressive or immunomodulatory therapies, persons with allergies to egg proteins, thymus disorders, malignant neoplasms, transplant recipients, and persons with symptomatic HIV infection should not get the Yellow Fever vaccine. If vaccination is contraindicated for medical reasons an exemption letter or waiver should be issued to the traveller. However, acceptance of such a letter is at the discretion of the destination country, and entry might be denied.