This guide answers both, along with everything that follows from them: which countries the rules apply to, how the certificate works now that it lasts a lifetime, who cannot have the vaccine and what happens then, what it costs, and how long before departure you need to come in. We give yellow fever vaccinations at Evans Pharmacy in Malvern and Claines Pharmacy in Worcester, and we see the whole range of situations, from a straightforward safari to a round-the-world itinerary where the paperwork is the complicated part.

What yellow fever actually is

Yellow fever is a viral illness spread by mosquitoes that bite during the day. Most people who catch it have a few unpleasant days of fever, headache and aching muscles and then recover. A minority go on to a second, far more serious phase involving jaundice, which is where the name comes from, along with bleeding and organ failure. That severe form kills a significant proportion of those who develop it.

The reason travel clinics take it so seriously is simple: there is no antiviral treatment. Hospital care can support someone through the illness, but nothing cures it. Prevention is the whole of the strategy, and it comes in two parts, the vaccine and avoiding bites in the first place.

Required or recommended? The distinction that matters most

Almost every piece of confusion about yellow fever comes from these two ideas being mixed together. They are separate, and a trip can involve one, both or neither.

This is why we ask for your full itinerary rather than just your destination. A fortnight in Kenya raises both questions at once. A holiday in Thailand raises neither, unless you happen to be arriving from South America, in which case the paperwork question appears from nowhere. Working out which of the two applies to you is the first thing we do at your appointment.

Which applies to you? Four quick questions

Answer these and you will see the starting point we would work from, covering both the protection question and the paperwork one. It is guidance, not a decision: nothing here can tell you whether a vaccine is suitable for you, and nothing is stored or sent anywhere.

Which countries are involved

Yellow fever circulates in two parts of the world, and the entry rules ripple out from there to affect countries far beyond them.

Two things make a printed list a poor way to settle this. First, risk is frequently regional rather than national, so naming a country tells you less than naming the states or provinces you will actually visit. Second, both the risk maps and the entry requirements are revised as the situation changes. We check your specific route against the current NaTHNaC guidance at your appointment rather than working from a list that was accurate last year.

The certificate, and why it now lasts a lifetime

The official document is the International Certificate of Vaccination or Prophylaxis, usually just called the yellow fever certificate. Two facts about it save travellers a great deal of money and worry.

Many people still believe their certificate expires after ten years, because for decades it did. If you were vaccinated before the rules changed and your certificate says ten years on it, it is still valid: the change applies to existing certificates too. If yours has been lost or damaged, a replacement can be issued for £15 rather than starting again with another vaccination.

The vaccine itself

The yellow fever vaccine used in the UK is Stamaril. It is a live attenuated vaccine, meaning it contains a weakened form of the virus, given as a single dose into the upper arm. It is licensed from nine months of age and produces protection that lasts for most people’s lifetime, which is the medical reasoning behind the certificate change.

Being a live vaccine is also the reason it needs more careful assessment than most travel jabs, and the reason it can only be given at a registered centre.

Who can have it, and who needs a closer look

This is the part of the conversation that a website cannot finish for you, and we would be doing you a disservice if we pretended otherwise. What follows is the shape of the assessment, not a verdict.

If the vaccine is not suitable for you

Where vaccination is genuinely not appropriate but a country requires a certificate, there is a recognised route: a medical exemption letter, issued after assessment, explaining why the traveller cannot be vaccinated. It is worth knowing two things about them. Acceptance is ultimately at the discretion of the country you are entering, and they take time to arrange properly, so this is not a last-week job. If you think this may apply to you, call us with your itinerary and we will talk you through the options.

Side effects and safety, honestly

Most people have either no reaction or a mild one: a sore arm, a headache, aching muscles or a slight temperature for a few days after the dose. That is the ordinary experience, and it passes.

Rare but serious reactions do exist, and being straight about them matters more than reassurance. Two are specifically associated with yellow fever vaccination: a neurological reaction and a viscerotropic one, which affects the internal organs. Both are very uncommon, and both are more likely in older adults and in people whose immune systems are suppressed. That is precisely why those groups get the closer assessment described above rather than a routine appointment, and why the vaccine is confined to registered centres with trained clinicians. Weighed against a disease with no cure, for a traveller heading into a genuine risk area, the balance for most people falls clearly on the side of vaccination, but it is a judgement made person by person.

Timing: how far ahead to book

The hard deadline is ten days. That is how long the certificate takes to become valid, and it is also roughly how long protection takes to establish, so a trip requiring a certificate cannot be arranged inside that window.

The sensible target is four to six weeks. That leaves room to plan yellow fever alongside whatever else your trip needs, since most itineraries that call for it also call for hepatitis A, typhoid and often more, and it leaves time for the fuller discussion if you fall into one of the groups that needs one. If you are already inside the ten-day window, call us anyway: we can tell you quickly whether your trip still works, and if it does not, what your options are.

Do you need a second dose?

For entry purposes, no. A single dose and a valid certificate is the requirement, and countries cannot demand a booster.

For protection, a further dose is occasionally advised for particular groups, for example people vaccinated during pregnancy, those vaccinated as very young children, travellers whose immune system was suppressed at the time of the first dose, and people heading back into an active outbreak area a long time after being vaccinated. It is an individual assessment rather than a routine renewal, and it is one of the things we check against your records.

Outbreaks change, so we check at your appointment

Yellow fever activity moves. Outbreaks flare in particular countries and regions, and both the risk maps and the entry requirements are updated in response. Rather than print a snapshot here that will be out of date within weeks, we check the current position against NaTHNaC guidance when you come in, which is also when we can tell you what it means for your specific route and dates.

What it costs

Frequently asked questions

Is the yellow fever vaccine really once for life?

For entry purposes, yes. Since the international rules changed in 2016 the certificate is valid for the life of the person vaccinated, and countries cannot require a booster for entry. A further dose is occasionally advised for particular groups on protection grounds, which is assessed individually.

My certificate says it expires after ten years. Is it still valid?

Yes. The change applies to certificates issued before it as well, so an older certificate showing a ten-year expiry remains valid. Bring it with you and we will confirm it.

How long before travel do I need the vaccine?

At least ten days, because that is when the certificate becomes valid. Four to six weeks is better, so we can plan it alongside your other vaccinations and allow time for a fuller discussion if you need one.

Do I need the yellow fever vaccine for Thailand or India?

Not for the vaccine’s own sake, because neither country has yellow fever. A certificate can still be required if you are arriving from or transiting a risk country, which is covered in our guide to entering Thailand without the yellow fever vaccine.

Can I have it if I am over 60?

Often, yes, but it needs a fuller conversation first, because rare serious reactions are more likely with age. It is a judgement made with you, not a rule that excludes you.

Can I have it while pregnant or breastfeeding?

It needs individual assessment, weighing the risk of the trip against the risk of a live vaccine. Bring your plans to a consultation and we will talk it through properly.

What if I cannot have the vaccine at all?

Where a certificate is required and vaccination is not appropriate, a medical exemption letter is the recognised route, issued after assessment. Acceptance is at the discretion of the destination country, and it takes time to arrange, so start early.

I have lost my yellow fever certificate. What now?

You do not need another vaccination. A replacement certificate can be issued for £15. Bring whatever documentation you still have.

Does the NHS provide the yellow fever vaccine?

Yellow fever is a private travel vaccine, and it can only be given at a registered Yellow Fever Vaccination Centre. We are registered, so you can have the vaccine and your certificate in the same appointment.

Is the yellow fever vaccine safe?

For most people it is very well tolerated, with mild arm soreness or a day or two of feeling off colour being typical. Rare serious reactions exist and are more likely in older adults and people who are immunosuppressed, which is why those groups are assessed more carefully rather than vaccinated routinely.

Can I have yellow fever at the same time as my other travel jabs?

Usually, yes, and it is generally the sensible way to do it. Your pharmacist will confirm the plan for your particular combination and timings at the appointment.

Do children need it?

The vaccine is licensed from nine months of age. Between six and nine months it is given only in specific circumstances after assessment, and it is not given below six months. Bring the whole family’s records and we will work through it together.