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Polio, paperwork and the 12-month rule: untangling ICVPs in travel health

October 2026

A vintage world map with colorful push pins marking various locations across the Middle East and Central Asia

Polio vaccination can be one of those areas of travel health that feels very straightforward - until an International Certificate of Vaccination or Prophylaxis (ICVP) becomes involved.

A traveller is fully vaccinated. Their last polio-containing vaccine was years ago. They are travelling to Afghanistan for five or six weeks. TravelHealthPro mentions a certificate on exit. Do they need another vaccine? Is this the usual ten-year booster? Does it need to be within twelve months? Can the GP give Revaxis on the NHS? Can the practice charge for the certificate? And what if they have already had a suitable vaccine recently but nobody wrote an ICVP at the time?

It is a good example of why I always recommend opening the polio section on the individual TravelHealthPro country page, rather than relying entirely on a remembered rule about boosters.

There are really several different issues happening at once.

First: think about three different “polio checks”.

1. Has the traveller completed their routine polio schedule?

The UK programme aims to provide a complete course of polio-containing vaccination. If somebody has an incomplete or uncertain history, that needs addressing regardless of the certificate issue. For most fully vaccinated UK adults, five appropriately spaced doses provide satisfactory long-term protection.

2. Is a booster recommended because of the traveller's individual risk?

This is where the familiar ten-year interval can appear. The NaTHNaC polio information states that travellers to areas with recent reports of polio whose last polio vaccine was ten or more years ago may require a booster, but the individual country page should always be checked because recommendations differ according to the type of poliovirus circulating and the traveller's circumstances. For example, the current Afghanistan advice is much more specific.

3. Is there a WHO/IHR requirement for a recent dose to be documented?

This is where the 12-month rule comes in. And it is not simply another version of the ten-year booster recommendation. WHO's temporary recommendations are designed primarily to reduce the international spread of poliovirus, rather than simply to protect the individual traveller. For countries subject to these measures, residents and long-term visitors may need evidence that they received a polio vaccine within the period four weeks to 12 months before leaving the affected country, documented on an ICVP.

That distinction is important.

A traveller can therefore be adequately vaccinated from an individual protection point of view, yet still encounter a certificate requirement because of the international public-health measures applying to the country. Afghanistan is a useful example. It remains infected with wild poliovirus type 1 and is currently subject to WHO temporary recommendations. TravelHealthPro advises that travellers intending to visit Afghanistan for four weeks or more should be aware that proof of polio vaccination recorded on an ICVP, with the vaccine given four weeks to 12 months before departure from Afghanistan, may be required on exit.

If suitable documentation cannot be produced, vaccination may be offered at the point of departure.

That last point is particularly relevant for some travellers because oral polio vaccine (OPV) is still used in some countries. The UK uses inactivated polio vaccine (IPV), usually within a combined vaccine such as Td/IPV. OPV is a live vaccine and is unsuitable for some people. Consequently, NaTHNaC specifically recommends an IPV-containing booster for people travelling to Afghanistan for four weeks or more who have not received polio-containing vaccine within the previous year if they are:

  • immunosuppressed;

  • a household contact of an immunosuppressed person;

  • pregnant;

  • otherwise unable to receive live oral polio vaccine; or

  • travelling to environments with extremely poor hygiene, such as refugee camps, or likely to be in close proximity to polio cases, for example some healthcare workers.

For an immunosuppressed traveller visiting an affected area for less than four weeks, another clock appears: an IPV-containing booster should be considered if they have not received one within the previous ten years.

This is exactly why “polio booster every ten years” is too simplistic.

What about the healthy, fully vaccinated traveller?

This is probably the trickiest part. For other travellers who are up to date with the UK schedule, the current Afghanistan page says that further vaccination is not routinely recommended. Yet in the very next part of the guidance it reminds us that evidence of a polio vaccination given four weeks to twelve months before leaving Afghanistan may still be required on exit.

So there can be a difference between “This person clinically needs a booster for their own protection” and “This person may need evidence of a recent dose to satisfy an international public-health requirement.”

That is a really useful distinction to explain to travellers.

It also means that I would not automatically give every traveller to Afghanistan another Revaxis simply because their last dose was more than twelve months ago. Check the duration of travel, their individual risk factors and, crucially, the current country-specific guidance. Equally, I would not dismiss the certificate wording because “they've already had five doses”. They are two different questions.

Don't forget to ask when they are leaving the country

Another easy trap is concentrating entirely on the date the traveller leaves the UK. For these polio requirements, the relevant timing is normally linked to departure from the affected country. A traveller going to Afghanistan for eight weeks therefore needs the calculation made backwards from the date they expect to leave Afghanistan, not simply from their UK departure date. For urgent travel, WHO recommends vaccination even when the full four-week interval cannot be achieved; vaccination by the time of departure can still provide benefit.

Already vaccinated within the last year? You may not need another dose

This is another useful practical point.

An ICVP can be completed retrospectively when the traveller has received an appropriate polio-containing vaccine within the previous 12 months, provided sufficient information is available to complete the certificate correctly - including the date, manufacturer and batch number. So before reaching for another vaccine, check the record. This can be particularly relevant if somebody has recently received Td/IPV for another reason.

ICVPs: worth keeping a small supply in general practice

Practices do not have to be Yellow Fever Vaccination Centres to complete a polio ICVP. NaTHNaC provides a very useful fact sheet covering supply and completion of the certificates. At the time of writing, ICVPs can be ordered from Harlow Printing Ltd. They are currently supplied in packs of ten for £10 including VAT, postage and packaging, with a minimum order of one pack. For a practice occasionally seeing travellers to Afghanistan or another country affected by the WHO recommendations, keeping ten certificates in a drawer may therefore save a surprising amount of inconvenience.

A few other useful practical points from the NaTHNaC guidance:

  • The name should match the traveller's passport.

  • Write “Poliomyelitis” in the vaccine/prophylaxis section - not “Revaxis”.

  • Record the manufacturer and batch number.

  • The traveller signs the certificate.

  • The practice or clinic stamp is required.

  • The certificate is valid from the date of vaccination and expires one year after that vaccination.

  • NaTHNaC currently recommends using separate ICVPs if somebody needs both yellow fever and polio documented, rather than recording both diseases on the same certificate.

One point I think is particularly important is that the guidance states that the certificate should be signed by the clinician who administered the vaccine.

What about the GP giving Revaxis and another clinic writing the certificate?

I have seen this handled several different ways in general practice.

  • One model is that the GP practice gives Revaxis and does not charge the traveller, then supplies the vaccine date and batch number and sends the traveller to a private clinic to have an ICVP completed. The private clinic may then charge perhaps £20 or so for the certificate. It sounds practical, but the current NaTHNaC completion guidance creates a potential difficulty. It states that (unlike with Yellow Fever) the clinician who administered the vaccine should sign the ICVP. Realistically, this would probably not be checked that thoroughly at the airport but I would be cautious about routinely relying on another provider to certify a vaccine they did not administer.

  • A second model is much simpler: the practice buys a small supply of ICVPs, gives the indicated Td/IPV and completes the certificate at the same appointment.

  • A third model I have encountered is essentially the same, but with the NHS vaccination provided free while the patient pays a small administrative charge for the certificate itself.

Whichever model a practice adopts, it is worth agreeing a practice policy rather than trying to work it out for the first time when a traveller is sitting in front of you.

Is Revaxis for travel NHS or private?

This is another area where the answer can become unnecessarily muddled. Polio is one of the travel vaccinations included within NHS general practice provision in England. Current NHS information lists polio, provided as part of combined Td/IPV vaccination, alongside hepatitis A, typhoid and cholera as vaccines that can be available free on the NHS. The 2026 GMS Statement of Financial Entitlements similarly includes poliomyelitis vaccination for people travelling to an area where they may be exposed to infection, using an age-appropriate combined vaccine.

BMA guidance is quite clear that where these vaccinations fall within GMS provision, a registered patient should not be charged for the NHS vaccination itself.

The certificate is a slightly different issue. GP practices can charge for certain non-NHS administrative services and certificates, so some practices separate the two: the clinically indicated polio vaccine remains an NHS service while a modest fee is made for completing the ICVP. Practices should have a clear local policy and check contractual or commissioning advice if unsure - particularly where an additional dose is being considered solely to meet certificate requirements rather than because the traveller has a clinical indication for another booster.

The important thing is not to turn a genuinely NHS-funded travel vaccination into a private vaccination simply because paperwork is required alongside it.

My practical clinic checklist

When I see polio mentioned on a destination page, I now work through it in this order:

  • Check the polio tab - every time.

  • Don't assume the requirement is simply “booster if more than ten years”.

  • Check whether the traveller is staying for four weeks or more.

  • Check their planned departure date from the affected country.

  • Look carefully at pregnancy, immunosuppression, household contacts, healthcare work and very poor-hygiene settings.

  • Check the date of their last polio-containing vaccine.

  • If it was within the last twelve months, consider whether an ICVP can simply be completed retrospectively rather than giving another vaccine.

  • If vaccination is required, think about the certificate at the same appointment.

  • And if you work in a non-YFVC, consider ordering a pack of ICVPs before you actually need one.

(I've made you an infographic below!)

The takeaway

Polio provides a perfect example of why travel medicine cannot always be reduced to a simple vaccine interval. There may be a routine schedule, a clinical travel recommendation and an international certificate requirement all operating at the same time - and they do not necessarily give the same answer.

The easiest way through it is not to try to memorise every permutation. Check the current country page, open the polio section, identify exactly why another dose is being considered, and then deal with the ICVP at the same time.

Sometimes the yellow bit of paper is every bit as important as the vaccine.

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