Yellow Fever certificate (ICVP) explained — who needs one and how to get it

What the ICVP actually is

The International Certificate of Vaccination or Prophylaxis (ICVP) is the official document that proves you've had a yellow fever vaccine, issued under the WHO International Health Regulations. It's a small yellow booklet — hence the nickname 'yellow card' — and it carries a specific stamp from a designated Yellow Fever Vaccination Centre (YFVC).

The certificate is what you show at border control in countries that require it. Without it, you can be refused entry or, in some cases, vaccinated on arrival, which most people understandably want to avoid.

Who needs one

Two scenarios trigger the requirement:

• You're travelling to a country that requires an ICVP from all arrivals. A small number of countries (mostly in sub-Saharan Africa) take this position. The list is on NaTHNaC TravelHealthPro and is updated as country rules change.
• You're travelling to a country that requires an ICVP only from arrivals coming from yellow fever risk countries. This is the more common requirement — you don't need one if you're flying straight from the UK, but you do if you've been in or transited through a yellow fever zone recently.

If neither applies to your trip, you don't need the certificate (although yellow fever vaccination itself may still be clinically recommended if you'll be in actual yellow fever risk areas — the certificate question and the clinical-protection question are related but separate).

The single-lifetime-dose rule

This is the biggest change in yellow fever travel rules in the last decade. Since 11 July 2016, the WHO amended the International Health Regulations so that a single dose of yellow fever vaccine confers lifelong protection for ICVP purposes. No more 10-yearly boosters required by the WHO standard.

Practical implications:

• If you were vaccinated and have a valid ICVP from any year (including before 2016), you don't need another dose for international travel under WHO rules.
• The certificate becomes valid 10 days after vaccination and stays valid for life.
• Some individual countries may take time to update their formal rules, but the WHO standard applies and travel-time disputes are rare.
• Some clinical situations (e.g. compromised immune response to the first dose) may warrant a discussion about an additional dose for medical reasons — but this is a clinical conversation, not an ICVP-rules conversation.

Where vaccination can be done

Yellow fever vaccine can only be administered — and the ICVP only issued — at a designated Yellow Fever Vaccination Centre. In the UK, designation is via NaTHNaC.

Our Leicester clinic is on the NaTHNaC YFVC register (Clarendon Pharmacy, premises 1034171). That means we can administer the vaccine and issue the ICVP same-day to anyone who's clinically eligible. We can also issue a medical letter of exemption (also recorded on an ICVP) where vaccination is contraindicated.

Medical exemptions

Yellow fever vaccine is a live attenuated vaccine. It's not appropriate for everyone. The situations where exemption may apply include:

• Significant immunocompromise (e.g. certain cancer treatments, advanced HIV with low CD4 counts, some biological therapies, organ transplant recipients).
• Severe egg allergy with prior anaphylaxis.
• Pregnancy — generally avoided unless travel to a high-risk area is unavoidable.
• Breastfeeding of infants under 9 months — generally avoided.
• Age extremes — not given under 9 months; caution and individual assessment for adults 60+ where they're receiving a first-ever dose.
• History of thymus disorder or thymectomy.

If yellow fever vaccination isn't appropriate but travel is going ahead, a YFVC can issue an exemption letter that is recorded on an ICVP. This is for medical reasons only — not for personal preference. The letter explains the clinical reason for not vaccinating and serves as the document presented at border control. Some destinations may still question or refuse it, so the discussion in the consultation also covers whether the travel itself is wise.

Lost certificates

The ICVP can't be regenerated from a central database — there isn't one. However, the practical options are:

• Go back to the issuing YFVC. If they can find your vaccination record, they can produce a duplicate certificate based on that record. Records are kept for the lifetime of the original certificate where possible.
• Trace through your GP record. If your YFVC notified your GP at the time, the record may be there.
• Re-vaccinate. If the record cannot be traced and the certificate is needed for imminent travel, a fresh yellow fever vaccination is clinically safe (you can have additional doses without harm, although it's only required clinically in specific situations) and produces a new valid ICVP. The certificate is valid 10 days after the new vaccination.

Don't leave this to the last minute — if you find out 5 days before travel that your certificate has gone missing, you may not be able to re-vaccinate in time given the 10-day validity rule.

Practical timing for a planned trip

If your trip needs an ICVP:

• Book 4–6 weeks before departure if possible. This gives time for any other recommended travel vaccines and any course-based vaccines (hepatitis B, rabies).
• Absolute minimum: 10 days before arrival in the destination, to satisfy the certificate-validity rule.
• Bring your passport and any previous vaccination records to the appointment.
• If you've previously been vaccinated, bring the existing certificate — you may already be covered for life and not need a new dose at all.

Children

The minimum age for yellow fever vaccination is 9 months. Vaccination of infants under 9 months is contraindicated. For children aged 9 months and older travelling to a yellow fever risk area, the vaccine and certificate are issued in the same way as for adults.

Why it has to come from a YFVC

The designation system exists for a reason. Yellow fever vaccine has a real (if low) risk of serious adverse events, and the right pre-vaccination clinical assessment matters — ruling out contraindications, assessing the risk-benefit balance for older or immunocompromised travellers, and giving the appropriate counselling. A non-YFVC clinic can't issue the ICVP regardless of the vaccine being administered, so the document wouldn't be valid for international travel.

NaTHNaC reviews YFVC designation periodically. The directory at nathnacyfzone.org.uk lets you find a designated centre near you.

The next step

If you need an ICVP for upcoming travel, the most useful single step is a yellow fever travel consultation 4–6 weeks before departure (or as early as possible if your trip is sooner). Bring your passport, any previous ICVPs, and the destination details. We'll confirm whether you need the vaccine clinically and whether the certificate is required for your specific itinerary, then issue same-day where appropriate.