Travel Vaccines: How Long Do They Actually Last?

One of the most common questions at travel clinics is whether a vaccine from a previous trip is still valid. The answer varies a lot depending on which vaccine it was. Some last a lifetime. Others need repeating every two years. Here's a straightforward breakdown.

Vaccines that last for life (or close to it)

Yellow Fever — one dose provides lifelong immunity. The WHO changed the recommendation from a 10-year booster to lifetime protection in 2016, and the International Certificate now states it's valid for the life of the person. If your certificate says something different, the current rules override it.

Hepatitis A — two doses given six to twelve months apart provide protection estimated to last at least 25-30 years, possibly for life. If you had the full two-dose course as an adult, you almost certainly don't need to repeat it.

Hepatitis B — three doses provide long-term protection for most people. Immunity generally lasts at least 20 years. Healthcare workers get periodic antibody checks, but for travellers the standard course is considered protective long-term without routine boosters.

MMR — the measles, mumps, and rubella vaccine. Two doses in childhood provide lifelong protection. If you're unsure whether you had it, your GP can check records or a blood test can confirm immunity.

Vaccines that need boosters

Typhoid — the injectable vaccine lasts three years. The oral capsule version lasts five years. If you got Typhoid more than three years ago and are going somewhere with real typhoid risk, you need another dose.

Tetanus/Diphtheria/Pertussis — the standard recommendation is a booster every ten years for tetanus and diphtheria. Many adults travelling to remote areas where wound care is limited get this checked before departure.

Rabies — pre-exposure vaccination provides protection but you still need post-exposure treatment if bitten. The key point is that if you've been vaccinated, you have more time before treatment becomes urgent and you don't need immunoglobulin, which is expensive and often unavailable remotely. Boosters for pre-exposure protection are typically needed every few years depending on ongoing risk.

Japanese Encephalitis — protection from the standard two-dose course lasts around one to two years. A booster one year after the primary course extends this significantly for people with ongoing exposure.

How to check what you've had

Your GP holds vaccination records, though coverage varies and old records from childhood can be incomplete. Some vaccines can be confirmed via blood test — a hepatitis B antibody test, for example, will show whether you have protective immunity. For others, repeating a dose if you're unsure is safe and often simpler than tracking down old records. Most travel vaccines can be safely repeated.

If you're a frequent traveller, keeping your own record makes the process faster each time you go.