Yellow Fever Vaccine for Travelers: Country-by-Country Requirements, Side Effects, and Where to Get It

If your trip touches sub-Saharan Africa or tropical South America, the yellow fever vaccine is one of the few travel vaccines you can be legally required to show at a border. It is also one of the harder vaccines to actually get in the United States, which is why so many travelers find out they need it three weeks before their flight and start panicking.

THis typically plays out in two ways. The first is the traveler who shows up to JFK with a printed itinerary to Kenya and no certificate, gets pulled aside, and has their trip disrupted. The second is the traveler who got vaccinated quickly at a "convenience" clinic, did not realize the dose needs to be administered at least 10 days before exposure, and is now trying to push back their flight. Both are preventable.

This guide explains what the yellow fever vaccine is, exactly which countries require proof of vaccination for entry, who should not get the vaccine, the realistic side effect profile, and how to actually obtain it on a normal travel timeline.

Quick answer: do I need the yellow fever vaccine?

You probably need the yellow fever vaccine if you are traveling to a country in sub-Saharan Africa or tropical South America where yellow fever circulates, or to any country that requires proof of vaccination as a condition of entry. The vaccine is given as a single dose that is now considered protective for life for most adults, must be administered at least 10 days before exposure, and is documented on an International Certificate of Vaccination or Prophylaxis (the "yellow card"). The most common required-entry destinations are Brazil, Bolivia, Ghana, French Guiana, and several Central African nations. Many other countries (including Kenya, Tanzania, South Africa, India, and Thailand) require the vaccine only if you are arriving from a yellow fever risk country, which is the rule that catches multi-country itineraries.

If you are flying directly from the US to a country that does not have yellow fever transmission, you do not need this vaccine, even if a friend got it for the same trip last year.

What yellow fever actually is

Yellow fever is a viral hemorrhagic illness spread by Aedes and Haemagogus mosquitoes in tropical regions of Africa and South America. After a 3 to 6 day incubation period, most people develop fever, headache, muscle pain, and nausea. About 15 percent progress to a more severe phase with jaundice (which is where the name comes from), bleeding, organ failure, and shock. The case fatality rate in that severe phase is roughly 30 to 60 percent. There is no antiviral treatment. Care is supportive.

That risk is exactly why border requirements exist. A single imported case can seed an outbreak in a country with the right mosquito vector but no recent endemic transmission. The yellow card is not bureaucracy for its own sake. It is a public health firewall.

The good news for travelers: the live attenuated yellow fever vaccine (in the US, that's YF-VAX, manufactured by Sanofi Pasteur) is one of the most effective vaccines we have. A single dose produces protective antibody levels in over 99 percent of recipients within 30 days, and current ACIP guidance is that one dose is protective for life for the vast majority of healthy adults. Boosters are only recommended for specific high-risk groups (more on that below).

Which countries require the yellow fever vaccine?

There are two categories of country requirements, and travelers mix them up constantly.

Category 1: Countries that require proof of vaccination for ALL travelers regardless of where you are flying from. These are the strictest. As of 2026, this list includes:

• Angola
• Benin
• Burkina Faso
• Burundi
• Cameroon
• Central African Republic
• Chad (parts)
• Republic of the Congo
• Democratic Republic of the Congo
• Côte d'Ivoire
• French Guiana
• Gabon
• Ghana
• Guinea-Bissau
• Liberia
• Mali
• Niger
• Rwanda
• Sierra Leone
• Togo
• Uganda

A handful of South American countries have moved between Category 1 and Category 2 in recent years based on local outbreak patterns. Bolivia and parts of Brazil currently require proof from all travelers entering certain regions. Always check the country's official entry requirements within 30 days of your trip, because policies move.

Category 2: Countries that require proof ONLY if you are arriving from a yellow fever risk country. This is the category that catches multi-stop travelers. If you fly New York to Nairobi, Kenya does not require the vaccine. If you fly New York to Accra to Nairobi, Kenya does require it because Ghana is on the risk list. Common Category 2 countries include:

• Kenya
• Tanzania
• South Africa
• Zambia
• Zimbabwe
• Botswana
• Namibia
• Egypt
• Ethiopia (for some travelers)
• India
• Thailand
• Indonesia
• Philippines
• Australia
• China

The list of "yellow fever risk countries" used to define this rule is maintained by WHO. As a practical matter: if any leg of your trip touches sub-Saharan Africa or tropical South America (other than direct departure from the US), assume you need the certificate and check.

CDC's "recommended" list is separate from the legal requirement list. CDC may recommend yellow fever vaccination for parts of a country (for example, the Brazilian Amazon, Peruvian jungle east of the Andes, or rural Colombia) even if no certificate is required at the airport. This is the medical recommendation. Border requirements are the legal layer on top.

For destination-specific yellow fever guidance, see our country health guides for Brazil, Kenya, Tanzania, Ghana, Ethiopia, Peru, and Colombia.

Who should and should not get the yellow fever vaccine

Yellow fever is a live attenuated vaccine. That single fact drives the entire contraindication list.

You should get the vaccine if:

• You are 9 months or older and traveling to a country where yellow fever circulates
• You are entering a country that legally requires proof of vaccination
• You are working or volunteering in an endemic region for an extended period
• You handle yellow fever virus in a laboratory

Absolute contraindications (do not get the vaccine):

• Infants younger than 6 months
• Severe allergy to a vaccine component, including eggs, chicken proteins, or gelatin
• Severely immunocompromised status: active untreated HIV with low CD4 counts, current chemotherapy, transplant patients on immunosuppression, primary immunodeficiencies, thymus disorders or thymectomy

Precautions (talk to a travel medicine physician before deciding):

• Age 60 or older (slightly higher rate of serious adverse events on first vaccination)
• Infants 6 to 8 months old
• Pregnant or breastfeeding (case-by-case based on outbreak risk)
• Asymptomatic HIV with CD4 200 to 499
• Family history of severe vaccine reaction

Patients in the contraindication category who must travel to a required-entry country can usually obtain a medical exemption letter, which functions as the legal equivalent of the certificate at most borders. Your travel medicine clinician issues this letter on official letterhead and stamps it with the same authorized provider stamp used for the yellow card. Keep in mind that a few countries reserve the right to deny entry or require quarantine even with an exemption letter, so confirm in advance.

Side effects of the yellow fever vaccine

Most travelers tolerate the yellow fever vaccine well. In my practice, the typical experience is a sore arm for a day or two, mild fatigue, and sometimes a low grade fever or muscle aches starting 4 to 7 days after the shot. That timing is the giveaway. Unlike most vaccines, where side effects show up in the first 48 hours, yellow fever side effects often peak around day 5. This catches travelers off guard.

Common reactions (10 to 30 percent of recipients):

• Pain or redness at the injection site
• Mild headache
• Low grade fever
• Body aches
• Fatigue

These resolve in 1 to 3 days. Acetaminophen is fine. Over-the-counter ibuprofen is fine.

Rare but serious reactions:

• Yellow fever vaccine-associated viscerotropic disease (YEL-AVD): an extremely rare reaction where the vaccine virus replicates and causes multi-organ illness similar to wild yellow fever. Estimated rate is roughly 0.3 to 0.4 cases per 100,000 doses, higher in adults over 60.
• Yellow fever vaccine-associated neurologic disease (YEL-AND): rare neurologic complications including encephalitis, Guillain-Barré syndrome, and acute disseminated encephalomyelitis. Estimated rate is 0.4 to 0.8 per 100,000 doses, also higher in older adults.

These numbers sound alarming and they should be taken seriously, but they are also the reason the contraindication list above exists. For a healthy 35 year old going on safari, the risk of a serious vaccine reaction is dramatically lower than the risk of acquiring yellow fever in an endemic area without protection.

If you develop high fever, severe headache, jaundice, confusion, or unusual weakness within 30 days of vaccination, seek medical care immediately and tell the clinician you recently received the yellow fever vaccine.

The 10-day rule and why it matters

This is the single most common timing mistake travelers make.

The yellow fever vaccine produces protective antibody levels by approximately day 10 after vaccination. The International Health Regulations (IHR) recognize the certificate as valid starting 10 days after the date of vaccination. If your certificate is dated less than 10 days before your arrival, border officials in a Category 1 country can legally deny entry, send you to airport quarantine, or vaccinate you on the spot before allowing you in.

Practical timing rules:

• Schedule your vaccine at least 3 weeks before departure (gives you a 10-day buffer plus time to recover from minor side effects)
• The certificate is valid for life as long as the vaccine was a WHO-prequalified dose
• If you have a layover in a Category 1 country and your certificate is less than 10 days old, you can be denied transit even without leaving the airport in some jurisdictions

Travelers who book a trip on short notice and discover they need yellow fever often try to find a same-day appointment. Even if you find the dose, you cannot legally arrive in a required-entry country sooner than 10 days after the shot. Build that into your timeline.

Where to get the yellow fever vaccine in the United States

This is where it gets frustrating. Yellow fever vaccine is not stocked at most pharmacies and is not part of routine primary care inventory in the US. The vaccine is only administered at clinics that have completed registration as Yellow Fever Vaccination Stamp Centers, which gives them the authorized provider stamp required to issue a valid international certificate.

Your realistic options:

1. A registered yellow fever vaccination center. State health departments maintain searchable directories of authorized providers. CDC also maintains a national locator. Many of these clinics are travel medicine clinics, public health departments, or hospital-based travel clinics.

2. Online travel health platforms with brick-and-mortar partners. Some online platforms (including Wandr) handle the prescription, paperwork, and provider stamp logistics, then route you to a partner clinic in your area for the actual injection. This is often faster than calling around to individual clinics.

3. Your primary care doctor. Almost certainly cannot administer it. Most general practices in the US do not stock yellow fever vaccine and do not have the stamp. Do not assume your annual physical clinic can do this.

In my experience, the time-wasters are travelers who call 6 or 7 pharmacies before realizing pharmacies do not stock it, then try to get a same-week travel clinic appointment. By the time they call us, they have already lost two weeks. If your trip touches an endemic country, get on this in week one of trip planning.

Need yellow fever fast? Book your travel vaccine appointment online with Wandr and we will route you to a yellow fever-authorized clinic in your area, with the certificate paperwork prepared in advance.

Cost of the yellow fever vaccine

Pricing varies widely based on whether the clinic is private, public health, or hospital-based.

• Public health departments: typically $135 to $185 for the dose plus a small administration fee
• Travel medicine clinics: typically $200 to $325 for the dose, plus consultation fees ($75 to $200), plus an administration fee
• Hospital-based travel clinics: often the highest, $300 to $450 once consultation and admin are added in

Most insurance plans do not cover travel-only vaccines. Yellow fever is almost never covered by commercial US health insurance because it is classified as a non-routine travel vaccine. Some HSA and FSA plans do reimburse for it, so save your receipt and certificate.

Before you book, ask the clinic three questions:

1. What is the all-in cost (vaccine + consult + admin)?
2. Are you a registered yellow fever vaccination center with a valid stamp?
3. How recent is your dose? (Vaccine has a finite shelf life once reconstituted)

If a clinic cannot answer all three, find another clinic.

The International Certificate of Vaccination (yellow card)

When you receive a valid yellow fever vaccine, the provider fills out an International Certificate of Vaccination or Prophylaxis (ICVP), commonly called the yellow card because of its color. This document is the only legally recognized proof of vaccination at international borders.

Required elements on a valid certificate:

• Your full name and date of birth (matching your passport exactly)
• Vaccine name and manufacturer
• Vaccine batch number
• Date of vaccination
• Authorized provider's signature and the Yellow Fever Vaccination Stamp Center stamp
• Dose validity (with the 2016 WHO update, the certificate is now valid for life)

Carry the original yellow card with your passport. A photocopy is not legally sufficient at most borders. If you lose the card, the issuing clinic can re-issue a duplicate from their records, but only the original clinic that administered the dose can do this. Take photos of both sides as backup.

When you need a booster (and when you don't)

In 2016, WHO updated the IHR to recognize a single yellow fever vaccine dose as valid for life. Most countries adopted this standard. ACIP guidance in the US aligns with this for healthy adult travelers.

Boosters are still recommended for specific groups:

• Lab workers who handle yellow fever virus
• Pregnant patients at the time of their first vaccination (re-vaccinate after pregnancy)
• HIV-positive patients at the time of vaccination
• Patients who received a hematopoietic stem cell transplant after vaccination
• Travelers planning prolonged or high-exposure travel to outbreak regions, particularly more than 10 years after first dose, on a case-by-case clinical basis

If you were vaccinated in the 1990s as a child or for a single trip and have not been back to an endemic region since, you are most likely still covered. If you are unsure, your clinic can review the original certificate and confirm.

How to plan: a 4-week pre-trip timeline

Here is the timeline I give to patients in clinic:

Week 4 before departure:

• Confirm whether your destination is Category 1 (always required), Category 2 (required if arriving from a risk country), or recommended only
• Check the official entry requirements on the destination country's foreign affairs site
• Find a registered yellow fever vaccination center near you, or book through a travel health platform

Week 3 before departure:

• Get the vaccine
• Review your certificate before leaving the clinic. Confirm name, date of birth, signature, and stamp.
• Take a photo of both sides

Week 2 before departure:

• Mild side effects, if they show up, usually resolve by now
• Confirm your other recommended vaccines (typhoid, hepatitis A, polio booster, MMR if needed)
• Pack the certificate with your passport, not in checked baggage

Week 1 before departure:

• Final pharmacy pickup for any travel medications (antimalarials, traveler's diarrhea antibiotic, altitude sickness if relevant)
• Re-verify entry requirements have not changed (yellow fever rules occasionally update on short notice during outbreaks)

This is also the time most travelers realize they need a pre-trip health check to coordinate vaccines, prescriptions, and documentation in one place.

Yellow fever vs. other tropical diseases: don't confuse them

Travelers regularly mix yellow fever up with three other illnesses. Quick clarifications:

• Dengue fever: also mosquito-borne in similar regions, but a different virus and a different vaccine pathway. The yellow fever vaccine does not protect against dengue. (See our dengue fever travelers guide for prevention.)
• Malaria: parasitic, not viral. Prevented with antimalarial pills, not vaccines. The yellow fever vaccine does not protect against malaria, and antimalarial pills do not protect against yellow fever. You may need both.
• Japanese encephalitis: mosquito-borne, but in different geographic regions (parts of Asia). Different vaccine entirely.

If your trip is to a multi-disease region (the Brazilian Amazon, parts of West Africa, or rural Southeast Asia), you may need a stack of two or three travel-specific interventions. A travel medicine consult sorts this out in 15 minutes.

Frequently asked questions

1. Is the yellow fever vaccine required for Kenya?

Only if you are arriving from a yellow fever risk country. Direct flights from the US to Kenya do not trigger the requirement. If your itinerary includes a layover or stop in a risk country (for example, transiting through Addis Ababa from a country on the risk list, or coming from Uganda), Kenya can require proof of vaccination at entry. CDC also recommends the vaccine for travelers spending time in northwestern Kenya near Lake Victoria.

2. Does the yellow fever vaccine protect for life?

For most healthy adults, yes. Since 2016, WHO and the IHR recognize a single dose as protective for life, and the certificate does not expire. ACIP recommends boosters only for specific groups: lab workers, pregnant patients at the time of first vaccination, HIV-positive patients, transplant recipients, and certain prolonged or high-exposure travelers.

3. Can I get the yellow fever vaccine while pregnant?

It is a precaution, not an absolute contraindication. Live vaccines are generally avoided in pregnancy. If you are pregnant and traveling to a country with active yellow fever transmission, the decision is made case-by-case with your travel medicine clinician based on outbreak risk, alternative options like postponing travel, and the legal entry requirement. If vaccinated during pregnancy, a booster after delivery is often recommended.

4. How much does the yellow fever vaccine cost in the US?

Typically $135 to $325 for the dose itself, plus consultation and administration fees that can bring the all-in cost to $200 to $450. Public health departments tend to be the most affordable. Most US health insurance plans do not cover travel-only vaccines. Save your receipt for HSA or FSA reimbursement.

5. Where can I get the yellow fever vaccine near me?

Only clinics registered as Yellow Fever Vaccination Stamp Centers can administer it and issue a valid certificate. Most US pharmacies and primary care offices do not stock it. Use the CDC and state health department directories, or book through an online travel health platform like Wandr that coordinates the appointment, paperwork, and authorized provider stamp.

6. Why do I need to get the vaccine 10 days before travel?

The International Health Regulations recognize the certificate as legally valid 10 days after the date of vaccination, because that is when protective antibody levels are reliably reached. If you arrive at a Category 1 country with a certificate dated fewer than 10 days earlier, border officials can deny entry, require quarantine, or administer the vaccine on the spot.

7. What is a yellow fever exemption letter and when do I need one?

If you have a medical contraindication (severe egg allergy, immunocompromised status, certain age groups) but must travel to a country requiring yellow fever vaccination, your travel medicine clinician can issue an exemption letter on official letterhead with the same Yellow Fever Vaccination Stamp Center stamp. This functions as the legal equivalent of the certificate at most borders, though a few countries may still require quarantine or alternative documentation.

8. Can children get the yellow fever vaccine?

Children 9 months and older can receive the vaccine. It is contraindicated in infants under 6 months due to a higher risk of vaccine-associated neurologic disease. Infants 6 to 8 months old fall into a precaution zone where the decision depends on the level of yellow fever risk at the destination.

9. What are the most common yellow fever vaccine side effects?

Sore arm at the injection site, mild headache, low grade fever, fatigue, and body aches. Side effects often peak around day 5 to 7 rather than the first 48 hours, which surprises travelers. Symptoms typically resolve within 3 days. Rare serious reactions (YEL-AVD and YEL-AND) occur at rates well below 1 per 100,000 doses, with slightly higher rates in adults over 60.

10. Do I need yellow fever vaccine for Brazil?

For most international travelers, yes. Brazil currently requires proof of vaccination for entry to specific regions where yellow fever circulates, including most of the country outside of large urban coastal areas. CDC recommends the vaccine for all travelers visiting affected states. Verify the latest entry rules within 30 days of travel since Brazilian regional requirements have updated several times in recent years.

Bottom line

Yellow fever vaccination is one of the few travel preparation steps where the consequences of skipping it can be both medical (a serious viral infection) and legal (denied entry at the border). It is also one of the most logistically annoying vaccines to obtain in the US because of the limited pool of registered providers.

If your trip touches sub-Saharan Africa or tropical South America, treat the yellow fever decision as a week-one trip planning task, not a week-three scramble. Confirm the requirement, find a registered provider, get the dose at least 10 days before departure, and travel with the original yellow card.

If you want this handled in one place, book your travel vaccines online with Wandr and we coordinate the authorized provider, the appointment, and the certificate paperwork so you don't spend a week calling pharmacies that don't stock the vaccine.

Wandr makes pre-trip health simple. Prescriptions sent to your local pharmacy, vaccines booked at registered clinics in your area, and a physician-led pre-trip health check that builds your full list in one visit. Start your pre-trip health check.

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About the author

Alec Freling, MD, is an emergency medicine physician and co-founder of Wandr Health. His clinical experience treating travelers in the ER, including post-travel viral illness, severe traveler's diarrhea, malaria, and altitude emergencies, shaped Wandr's physician-led approach to pre-trip travel health.

Medical disclaimer

This article is for educational purposes and does not replace personalized medical advice. Yellow fever vaccination decisions, including timing, contraindications, and exemption letters, should be made with a licensed travel medicine clinician familiar with your medical history and itinerary. Always verify entry requirements directly with the destination country within 30 days of travel.

Sources

1. CDC Yellow Book 2024: Yellow Fever (chapter 4)
2. WHO International Travel and Health: Yellow Fever Vaccination Country Requirements (current edition)
3. WHO Yellow Fever Fact Sheet, May 2023
4. Staples JE, Gershman M, Fischer M. Yellow Fever Vaccine: Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep 2010 (and 2015 booster update)
5. FDA Package Insert: YF-VAX (Sanofi Pasteur)
6. Pan American Health Organization, yellow fever surveillance bulletins
7. World Health Organization, International Health Regulations (2005), Annex 7

Last updated 2026-05-06. Verify country-specific requirements at the destination country's official entry portal within 30 days of travel.