Getting vaccinated is half the job. Proving it at the border is the other half. Here's what documents you need, how to get them, and what happens if you show up without them.
The International Certificate of Vaccination or Prophylaxis (ICVP), known as the "yellow card," is the standard WHO document for proving vaccination status across borders. It's a small yellow booklet issued by authorized vaccination centers when you receive certain vaccines, most commonly yellow fever.
The yellow card is the only document many countries will accept as proof of yellow fever vaccination. According to the WHO's International Health Regulations, countries can require it for entry, and it must be properly stamped and signed by an authorized provider to be valid. A printout from your doctor's office or a pharmacy receipt will not be accepted.
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Required if visiting or transiting through countries with yellow fever entry requirements. Must be the original physical document with the provider's stamp and signature. Valid 10 days after vaccination and lasts for life.
A record of all your vaccinations, including travel-specific and routine ones. Useful if you need medical care abroad and providers need your vaccination history. Keep a photocopy separate from the original.
If you're carrying prescription antimalarials or other travel medications, bring the prescription or a letter from your doctor. Some countries question travelers carrying medications without documentation.
Not vaccination-specific, but some countries require proof of health insurance for entry. Having it accessible alongside your vaccination records keeps everything in one place.
If you don't have a copy of your vaccination history, here's where to look:
Your primary care doctor or the travel clinic that vaccinated you should have records on file. Call and request a printed immunization history.
Most US states maintain an Immunization Information System (IIS) where providers report vaccines. Contact your state health department to request your records.
Schools and some employers require vaccination records for enrollment. If your provider's records are unavailable, your school or employer may have copies on file.
If records are completely unavailable, a blood test can confirm immunity to some diseases like hepatitis A, hepatitis B, and measles. Your doctor can order this.
For countries requiring yellow fever vaccination, arriving without your yellow card can mean denial of entry, forced vaccination at the border under unknown conditions, or quarantine for up to 6 days (per WHO International Health Regulations). Airlines may also refuse to board you if your destination requires proof you can't produce.
A Reddit post that circulated widely described a traveler who received the yellow fever vaccine but forgot to bring the physical yellow card to the airport. Even with a doctor's letter confirming the vaccination, border officials at some countries may not accept alternative documentation.
The lesson: getting vaccinated and having proof of vaccination are two separate tasks. Both need to happen before you leave. A travel vaccination reminder can prompt you for both.
Store your yellow card with your passport. Take a photo of both sides and keep it in your phone's photo library as a backup. If you travel internationally more than once, the same yellow card is used for all trips, so losing it means getting revaccinated or tracking down the original provider for a replacement.
For a full list of which vaccines you might need, see the travel vaccination checklist by destination. For timing, see how far in advance to get travel vaccinations.
It depends on your destination. Countries requiring yellow fever vaccination will ask for your International Certificate of Vaccination (yellow card) at entry. Some countries require polio or meningococcal proof. For other vaccines, records are recommended but not checked at the border.
The International Certificate of Vaccination or Prophylaxis (ICVP), commonly called the "yellow card," is a WHO-standardized document issued when you receive certain vaccines like yellow fever. It's your official proof of vaccination recognized internationally.
Contact your primary care doctor, the clinic where you were vaccinated, or your state immunization registry. Most states maintain an immunization information system (IIS) where providers report administered vaccines. For yellow fever specifically, contact the CDC-authorized center that vaccinated you.
Contact the clinic that administered your yellow fever vaccine. They should have records and can issue a replacement certificate. If the clinic is unavailable, your state health department may be able to help verify the vaccination through their registry.
Some countries accept digital records, but many still require the physical yellow card for yellow fever proof. The ICVP is the internationally recognized standard. Until digital certificates are universally accepted, bring the physical document.
Generally no. Domestic travel within the US does not require vaccination proof. However, keeping a copy of your records when traveling is a good practice in case you need medical care and providers need to know your vaccination history.
Set a reminder for your trip. Get notified weeks before departure so you have time for both the vaccine and the paperwork.
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