What travel vaccinations might I need, and what is a yellow fever certificate?
It depends entirely on destination, activities, duration and your own health — and the important distinction is between vaccinations that are recommended for your protection and those required as a condition of entry.
Recommended versus required:
Recommended vaccinations protect you. Nobody checks them at a border, and skipping them risks only your own health.
Required vaccinations are a legal condition of entry to certain countries, and you can be refused entry, quarantined or vaccinated at the border without one.
Yellow fever is the principal required vaccination. Under the International Health Regulations, many countries require proof of vaccination from travellers arriving from, or having transited, countries with risk of transmission. The document is the International Certificate of Vaccination or Prophylaxis — the yellow card.
Key points about it:
It becomes valid 10 days after vaccination, so last-minute travel is a problem — arriving before that period elapses means the certificate is not accepted.
It is now considered valid for life following a change to the International Health Regulations, replacing the previous ten-year validity. Older certificates remain valid.
It must be issued by a designated yellow fever vaccination centre, not any clinic.
Transit counts. Passing through an affected country, sometimes even without leaving the airport, can trigger the requirement at your destination — which catches people out on connecting itineraries.
A medical exemption letter is possible where vaccination is contraindicated, and acceptance is at the destination's discretion.
Commonly recommended for travel depending on destination: hepatitis A and B, typhoid, tetanus and diphtheria boosters, rabies for remote or animal-contact travel, Japanese encephalitis, cholera, and meningococcal vaccination — which is required by Saudi Arabia for pilgrimage travel, another genuine entry requirement.
Malaria is not vaccine-preventable in the same way for travellers, and prevention relies on antimalarial medication plus bite avoidance, which must be started before travel.
Timing matters. Some courses require weeks. Seek advice six to eight weeks before travel, from a travel clinic or your GP, and check the official national travel health guidance for your destination.
General information, not medical advice.