Yellow Fever Vaccine: Everything Travelers Need to Know
The yellow fever vaccine is one of the few vaccinations that can be legally required for international travel. Over 40 countries in Africa and South America require or recommend it, and some will deny entry without the International Certificate of Vaccination or Prophylaxis (ICVP) — the "yellow card."
Whether you're planning a safari in Kenya, a trek through the Amazon in Brazil, or a stopover in a transit country, understanding yellow fever vaccine requirements is essential. This guide covers who needs it, where it's required, how it works, and important contraindications.
Yellow fever by the numbers
Cases per year worldwide
200,000
Deaths annually (estimated)
30,000
Countries require vaccination
40+
Duration of vaccine protection
Lifetime
What Is Yellow Fever? Causes, Symptoms, and Transmission
Yellow fever is a viral hemorrhagic disease transmitted by infected Aedes and Haemagogus mosquitoes. It occurs in tropical and subtropical regions of Africa and South America. The disease gets its name from the jaundice (yellowing of the skin and eyes) that affects some patients.
Most infections are mild or asymptomatic, but approximately 15% of infected individuals develop a severe form with high fever, bleeding, jaundice, and organ failure. The severe form has a case fatality rate of 20–60%. There is no specific antiviral treatment — prevention through vaccination is the most effective strategy.
How yellow fever spreads
Yellow fever is caused by a flavivirus (family Flaviviridae). It is NOT transmitted person-to-person — only through the bite of an infected mosquito. Urban outbreaks occur when Aedes aegypti mosquitoes (the same species that transmits dengue and Zika) carry the virus between humans.
Yellow Fever Vaccine (YF-17D): Efficacy, Schedule, and Duration
The yellow fever vaccine is a live attenuated vaccine based on the 17D strain, developed in the 1930s. It is one of the most effective vaccines ever created, with a single dose providing immunity in over 99% of recipients within 30 days.
How the vaccine works
As a live attenuated vaccine, YF-17D contains a weakened form of the yellow fever virus that cannot cause disease in healthy individuals. After injection, the weakened virus replicates enough to stimulate a strong immune response — producing neutralizing antibodies that protect against future infection.
Yellow fever vaccine key facts
Name: YF-17D (brand names: Stamaril, YF-Vax). Type: Live attenuated. Route: Subcutaneous injection (0.5 mL). Doses: Single dose. Onset: Valid from 10 days post-vaccination. Duration: Lifetime (WHO 2016 — no booster needed).
Vaccine efficacy and lifetime protection
The yellow fever vaccine has an efficacy of approximately 99% after a single dose. In 2013, the WHO Strategic Advisory Group of Experts (SAGE) reviewed extensive evidence and concluded that a single dose provides lifelong protection. In 2016, the International Health Regulations were amended to remove the 10-year booster requirement.
Lifetime validity since 2016
Since July 2016, the ICVP for yellow fever is valid for the lifetime of the vaccinated person. Previously, boosters were required every 10 years. If your certificate shows an expiry date, it is still valid — lifetime validity applies retroactively to all previously issued certificates.
Which Countries Require Yellow Fever Vaccination?
The yellow fever vaccine is both legally required and medically recommended — but these are different things. Under the International Health Regulations (IHR 2005), countries can require proof of vaccination as a condition of entry.
- Traveling TO a country with yellow fever risk — the destination country requires vaccination for all arriving travelers.
- Traveling FROM or THROUGH a country with yellow fever risk — some countries require proof even for transit passengers (12+ hour layover).
Don't forget transit requirements
Transit requirements catch many travelers off guard. If your flight connects through a yellow fever–endemic country (even just a layover), your final destination may require proof of vaccination. Always check requirements for ALL countries in your itinerary, including transit stops.
Yellow fever vaccination requirements by country
Required for ALL travelers
Proof of vaccination required regardless of origin
- Angola
- Burundi
- Central African Republic
- Congo (Republic)
- Côte d'Ivoire
- Democratic Republic of Congo
- French Guiana
- Gabon
- Ghana
- Guinea-Bissau
- Liberia
- Mali
- Niger
- Sierra Leone
- Togo
Required if arriving FROM endemic area
Proof required only if traveling from a country with yellow fever risk
- Brazil (some states)
- Kenya
- Tanzania
- Uganda
- Ethiopia
- Rwanda
- South Africa
- Zambia
- Zimbabwe
- India
- Thailand
- Indonesia
- Saudi Arabia (Hajj)
Recommended (not legally required)
WHO recommends vaccination; entry may not be enforced
- Peru (Amazon region)
- Colombia
- Bolivia (eastern lowlands)
- Ecuador (Amazon basin)
- Venezuela
- Paraguay
- Senegal
- Cameroon
- Nigeria
- Sudan
This list reflects WHO ITHW 2026 recommendations but is subject to change. Always verify current requirements through your country's foreign affairs ministry or the WHO country list before travel.
How to Get the Yellow Fever Vaccine and ICVP Certificate
The yellow fever vaccine must be administered at a designated Yellow Fever Vaccination Centre. Not all clinics or GPs can give this vaccine — it requires special authorization. Find an authorized travel vaccination clinic near you.
Step-by-step: getting vaccinated
- 1
Find an authorized vaccination centre
Use Medova's clinic finder or check your national health authority's list of designated Yellow Fever Vaccination Centres. In the US, check the CDC's searchable database. In the UK, NaTHNaC maintains the list.
- 2
Book your appointment 4–6 weeks before travel
The vaccine becomes valid 10 days after administration. Book early enough to ensure coverage by departure. Some centres have waiting lists, especially during peak travel season.
- 3
Receive the vaccine and ICVP
After vaccination, the centre will issue your International Certificate of Vaccination or Prophylaxis (ICVP). This official yellow booklet is stamped and signed by the clinician. Keep it with your passport.
- 4
Wait for the 10-day validity period
Your ICVP becomes valid 10 days after vaccination. Arriving before day 10 may mean denial of entry, quarantine, or vaccination at the border.
Protect your yellow card
Keep your ICVP (yellow card) safe — it's an official international document. Take a photo/scan as a digital backup, but always carry the original. Some border officials will not accept digital copies. Never laminate it — stamps become unreadable.
Yellow Fever Vaccine Side Effects
The yellow fever vaccine is generally well tolerated. Most side effects are mild and resolve within a few days. However, as a live vaccine, rare but serious adverse events can occur.
Common side effects (10–30% of recipients, resolve in 1–3 days)
- ○Soreness, redness, or swelling at the injection site
- ○Low-grade fever (37.5–38.5°C)
- ○Headache
- ○Muscle aches (myalgia)
- ○Fatigue
Rare but serious adverse events
YEL-AVD (Viscerotropic Disease)
Severe multi-organ failure mimicking wild-type yellow fever. Incidence: ~0.3–0.4 per 100,000 doses. Fatality rate: ~65%. Higher risk in adults >60 and thymus disorder patients.
YEL-AND (Neurotropic Disease)
Neurological complications including encephalitis or Guillain-Barré. Incidence: ~0.8 per 100,000 doses. Usually self-limiting with good prognosis.
Severe allergic reaction (anaphylaxis)
Immediate hypersensitivity to egg protein or gelatin. Incidence: ~1.3 per 100,000 doses. Treatable if recognized promptly.
Who Should NOT Get the Yellow Fever Vaccine? Contraindications
Because YF-17D is a live vaccine, it is contraindicated in certain groups. If you cannot receive the vaccine, a medical waiver letter can be issued by your doctor.
Contraindications and precautions
- ○Infants under 6 months of age (absolute contraindication)
- ○Infants 6–8 months (only in epidemic situations, case-by-case)
- ○Severe egg allergy (anaphylaxis to eggs)
- ○Severe immunodeficiency (HIV CD4 <200, chemotherapy, organ transplant, high-dose steroids >14 days)
- ○Thymus disorders (thymoma, myasthenia gravis, prior thymectomy)
- ○Pregnant women (defer; consider risk-benefit if travel unavoidable)
- ○Breastfeeding women (defer if possible; rare cases of transmission via breast milk)
- ○Adults >60 receiving vaccine for the first time (increased YEL-AVD risk)
- ○Previous severe reaction to a yellow fever vaccine dose
Medical waiver option
If you cannot receive the yellow fever vaccine due to a medical contraindication, your doctor can issue a medical waiver letter on the ICVP form. Some countries accept this waiver; others may still deny entry or impose quarantine. Contact the embassy of your destination country to confirm their policy.
Vaccine Interactions: What Can Be Given Together?
As a live vaccine, yellow fever has specific timing considerations. For the complete timing guide, see our Travel Vaccine Schedule article.
Same-day administration
Yellow fever can be given on the same day as other live vaccines (MMR, varicella, oral typhoid) or inactivated vaccines (Hepatitis A/B, typhoid injectable, rabies). If not given on the same day as another live injectable vaccine, wait at least 28 days.
MMR interaction note
Studies show giving yellow fever and MMR simultaneously may slightly reduce the immune response to both. If possible, give them 28 days apart. If time is limited, simultaneous administration is still acceptable — protection is adequate.
Frequently Asked Questions
Do I need a yellow fever booster every 10 years?
No. Since 2016, the WHO confirmed that a single dose provides lifetime protection. You do not need a booster, even if your old certificate shows an expiry date. The lifetime validity is retroactive.
Can I enter a country without the yellow fever vaccine?
If a country legally requires it and you don't have proof, you may be denied entry, quarantined, or vaccinated on the spot. Some countries accept a medical waiver, but not all.
Is the yellow fever vaccine safe during pregnancy?
Generally not recommended because it's a live vaccine. If travel to a high-risk area is unavoidable and infection risk outweighs theoretical vaccine risk, vaccination may be considered case-by-case. Consult your doctor.
How much does the yellow fever vaccine cost?
Costs vary: US $150–$350 (incl. ICVP), UK £60–£85 through NHS-approved centres, Germany €50–€80. Many travel insurance policies cover travel vaccines — check your plan.
What if my yellow card is lost or damaged?
Contact the vaccination centre that issued it. They should have records and can issue a replacement. If unavailable, a new dose may be required. Keep a digital backup.
Related Reading
Continue your travel health preparation with these guides:
- Malaria Prevention for Travelers — medication, mosquito nets, and repellent strategies
- Travel Vaccinations for Southeast Asia — country-by-country vaccine recommendations
- Health Guide for East Africa: Kenya, Tanzania, Uganda — yellow fever, malaria, and more
- The Ultimate Pre-Travel Health Checklist — step-by-step preparation guide
Important Disclaimer
Medical disclaimer
This information is provided for educational purposes only and does not constitute medical advice. Yellow fever vaccine requirements change frequently based on outbreak situations and government policy. Always verify current requirements with official sources (WHO, your national travel health authority, or the destination embassy) and consult a healthcare professional before vaccination.
Sources: WHO Position Paper on Yellow Fever Vaccines (2013, reaffirmed 2023), WHO International Travel and Health 2026, CDC Yellow Book 2026, WHO IHR (2005) Annex 7. Last updated: March 2026.