Travel Vaccines: Which Shots You Need Before Your Trip

Required versus recommended: why the difference matters

A *required* vaccine is one that a country mandates for entry — typically documented with an official vaccination certificate. Yellow fever is the clearest example: certain countries in tropical Africa and South America require proof of yellow fever vaccination, and some countries require it if you are arriving from a yellow fever-endemic region 1Ref 1Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Overview of travel vaccine categories (required vs. recommended), destination-specific risk framework, and timing guidance for travel medicine consultations2Ref 2Centers for Disease Control and Prevention (2023).Yellow Fever — CDC Yellow Book 2024.Yellow fever vaccine requirements for entry, endemic regions, and precautions in pregnancy.

A *recommended* vaccine is one that health authorities advise because of real disease risk at your destination, even though no one will check a certificate at the border. Both categories matter for your safety — required vaccines keep you from being turned away at the border; recommended vaccines keep you from getting seriously ill.

Which travel vaccines come up most often?

The following vaccines come up frequently in travel medicine consultations, depending on destination and activities 1Ref 1Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Overview of travel vaccine categories (required vs. recommended), destination-specific risk framework, and timing guidance for travel medicine consultations3Ref 3Centers for Disease Control and Prevention (2024).Routine Vaccines for Travel — CDC Travelers' Health.Importance of reviewing routine vaccines before travel, including MMR and Tdap:

• Hepatitis A — recommended for most destinations outside of Western Europe, Australia, New Zealand, Japan, and North America, because it spreads through contaminated food and water 4Ref 4Nelson NP, Link-Gelles R, Hofmeister MG, Romero JR, Moore KL, Ward JW, Schillie SF (2018).Update: Recommendations of the Advisory Committee on Immunization Practices for Use of Hepatitis A Vaccine for Postexposure Prophylaxis and for Preexposure Prophylaxis for International Travel.Hepatitis A vaccine recommendation for international travel to most destinations outside high-income Western countries, and onset of protection timing.
• Typhoid — recommended for many destinations in South Asia, Africa, and Latin America, particularly for travelers eating outside tourist restaurants 5Ref 5Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Typhoid vaccine recommendation for travel to South Asia, Africa, and Latin America.
• Hepatitis B — considered for destinations with high rates of the infection if you plan to have medical procedures, engage in activities with exposure risk, or travel for extended periods.
• Meningococcal vaccines — required for Hajj pilgrims; recommended for sub-Saharan Africa's 'meningitis belt' during the dry season.
• Japanese Encephalitis — relevant for long-term travel to rural parts of Asia 6Ref 6Hills SL, Walter EB, Atmar RL, Fischer M; ACIP Japanese Encephalitis Vaccine Work Group (2019).Japanese Encephalitis Vaccine: Recommendations of the Advisory Committee on Immunization Practices.Japanese encephalitis vaccine indication for long-term rural travel to Asia, and the two-dose series requirement.
• Rabies pre-exposure vaccine — considered for travelers going to areas with high rabies risk, especially those doing outdoor activities, working with animals, or traveling far from medical care.
• Yellow fever — both required for entry to certain countries and medically important for travelers to endemic regions 2Ref 2Centers for Disease Control and Prevention (2023).Yellow Fever — CDC Yellow Book 2024.Yellow fever vaccine requirements for entry, endemic regions, and precautions in pregnancy.
• Malaria — not a vaccine but a medication; antimalarials are commonly prescribed for travel to certain regions 7Ref 7Centers for Disease Control and Prevention (2023).Malaria — CDC Yellow Book 2024.Malaria as a medication-based prevention (not a vaccine) required for travel to endemic regions.

Do not forget your routine vaccines before traveling

Travel is also a good time to confirm your routine vaccines are current 8Ref 8Wodi AP, Issa AN, Moser CA, Cineas S (2025).Advisory Committee on Immunization Practices Recommended Immunization Schedule for Adults Aged 19 Years or Older — United States, 2025.Importance of reviewing routine vaccines (MMR, Tdap, hepatitis B, annual flu) before international travel. Measles has re-emerged in outbreaks in several countries; if you have not had two doses of MMR (or confirmed immunity), updating this before international travel is worth discussing. Other routine vaccines to review include Tdap or Td if overdue, COVID-19 vaccination per current guidance, your annual flu shot (particularly relevant if traveling during flu season or to regions where flu circulates year-round), and hepatitis B if you never completed the series.

A travel medicine clinician will review all of these as part of your consultation.

Why does the four-to-six-week timing rule matter?

Some travel vaccines require more than one dose, spaced weeks apart 1Ref 1Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Overview of travel vaccine categories (required vs. recommended), destination-specific risk framework, and timing guidance for travel medicine consultations:

• Japanese Encephalitis is a two-dose series 6Ref 6Hills SL, Walter EB, Atmar RL, Fischer M; ACIP Japanese Encephalitis Vaccine Work Group (2019).Japanese Encephalitis Vaccine: Recommendations of the Advisory Committee on Immunization Practices.Japanese encephalitis vaccine indication for long-term rural travel to Asia, and the two-dose series requirement
• The full hepatitis B series takes several months
• Rabies pre-exposure prophylaxis is a two-dose series

Even for single-dose vaccines, your immune system needs one to two weeks to build a full response. This is why most travel medicine providers recommend coming in at least four to six weeks before departure.

That said, even a last-minute consultation a week before your trip can still offer some protection — go even if time is short. Some vaccines (such as hepatitis A) begin offering protection within a couple of weeks 4Ref 4Nelson NP, Link-Gelles R, Hofmeister MG, Romero JR, Moore KL, Ward JW, Schillie SF (2018).Update: Recommendations of the Advisory Committee on Immunization Practices for Use of Hepatitis A Vaccine for Postexposure Prophylaxis and for Preexposure Prophylaxis for International Travel.Hepatitis A vaccine recommendation for international travel to most destinations outside high-income Western countries, and onset of protection timing.

Where should I go to get travel vaccine guidance?

A travel medicine clinic or a primary care provider with travel medicine experience is the right setting. The CDC's Travelers' Health website (*wwwnc.cdc.gov/travel*) lists destination-specific recommendations and is a reliable self-research starting point, but it does not replace a personalized consultation that accounts for your full health history, medications, and specific itinerary 1Ref 1Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Overview of travel vaccine categories (required vs. recommended), destination-specific risk framework, and timing guidance for travel medicine consultations.

Some destinations have complex overlapping risks — a single region might involve yellow fever, malaria, hepatitis A, and typhoid all at once. Specialized travel medicine clinics are found at many hospitals, university health centers, and dedicated travel health practices.

Special situations: pregnancy, immunocompromise, and young children

Several travel vaccines are live attenuated vaccines — yellow fever and live oral typhoid are the main ones — and require extra consideration in certain situations 1Ref 1Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Overview of travel vaccine categories (required vs. recommended), destination-specific risk framework, and timing guidance for travel medicine consultations2Ref 2Centers for Disease Control and Prevention (2023).Yellow Fever — CDC Yellow Book 2024.Yellow fever vaccine requirements for entry, endemic regions, and precautions in pregnancy:

• Pregnancy: Live vaccines are generally avoided or used with caution. The risk-benefit discussion with a clinician is essential before assuming any travel vaccine is safe.
• Immunocompromising conditions: Live vaccines may be contraindicated. Some destinations carry unavoidable risks that may warrant reconsidering the itinerary or timing.
• Young infants: Age limits apply to several travel vaccines; a pediatric travel medicine consult is worthwhile for trips with infants.