Hepatitis A and B for Travelers: Who Needs Them and When
Hepatitis A and B for travelers are among the most important vaccine-preventable infections to address before any international trip. Both viruses target the liver and can cause serious illness, yet travelers skip these shots far too often. A visit to our Travel Clinic before departure puts you ahead of the risk.
By TravelBug Health Team, Travel Health Specialists
What Hepatitis A and B Actually Do to the Liver
Both forms of viral hepatitis, hepatitis A and hepatitis B, are caused by distinct viruses that damage liver cells, though they differ substantially in how they spread, how long they persist in the body, and what complications they can cause.
Hepatitis A is an acute infection transmitted through consuming contaminated food or water. Most healthy adults recover fully within weeks to a few months, but the illness can cause severe liver inflammation in older adults and individuals with existing chronic liver disease. Symptoms include jaundice, fatigue, nausea, dark urine, and abdominal discomfort. There is no chronic form of hepatitis A, but a significant acute episode can require hospitalization and weeks of recovery.
Hepatitis B spreads through exposure to infected blood, sexual contact, and from mother to child during birth. Unlike hepatitis A, hepatitis B can establish a chronic infection that persists for life. The World Health Organization (WHO, 2024) estimates that approximately 296 million people worldwide live with chronic hepatitis B. Chronic hepatitis B is one of the leading causes of liver cirrhosis and hepatocellular carcinoma globally, which underscores why hepatitis vaccines remain central to international travel preparation.
Understanding both viruses gives travelers the foundation they need to make informed decisions about pre-travel care, rather than treating vaccination as optional.
Who Is at Highest Risk During International Travel
The CDC is clear: most unvaccinated individuals traveling outside the United States to countries where hepatitis A or hepatitis B is common should receive the appropriate vaccines before departure.
Hepatitis A risk is elevated across most of Latin America, sub-Saharan Africa, South and Southeast Asia, Eastern Europe, and the Middle East, particularly in areas with limited access to clean water and adequate sanitation. Hepatitis B is endemic throughout much of Asia, Africa, and the Pacific Islands, where transmission can occur through healthcare exposure, unscreened blood products, tattooing with shared equipment, and unprotected sexual contact.
Travellers at especially elevated risk include:
- Those visiting friends and relatives in endemic regions
- Long-term travelers spending more than four weeks abroad
- Healthcare workers providing care in low-resource settings
- Travelers seeking dental or surgical procedures in other countries
- Adventure travelers who may sustain injuries requiring medical attention
- Individuals with chronic liver disease or conditions that impair immune response
People with pre-existing liver disease face amplified danger from both viruses. Contracting hepatitis A on top of an existing chronic liver condition significantly increases the risk of acute liver failure. Seeking medical advice from a travel health specialist at least six to eight weeks before departure is the best way to build a complete protection plan.
Hepatitis A and B for Travelers: Vaccine Options and Schedules
Hepatitis vaccines are among the safest and most studied available in modern medicine. The hepatitis A vaccine is given as a two-dose series at zero and six to twelve months, and a single dose provides effective short-term immunity. The hepatitis A vaccine is most effective if administered at least two weeks before travel, but still has benefit right up until time of departure.
The hepatitis B vaccine is available in different formulations and several different schedules. We strongly recommend consulting with a travel health professional to determine which course of hepatitis B vaccine is best suited to your itinerary. We generally recommend the hepatitis B vaccine (Heplisav-B) that provides the highest level of protection with the fewest number of doses; 2 doses, 28 days apart.
A combined hepatitis A and B vaccine, commercially known as Twinrix, allows travelers to complete coverage for both viruses with a single series. The combined vaccine offers convenience but it is critically important to complete the full series to be protected. Too frequently we see travelers who get a single dose of Twinrix at their pharmacy and think they are protected when they actually are not.
The vaccines work by prompting the immune system to produce antibodies targeting each virus. Those antibodies circulate in the blood and neutralize the virus before it can infect liver cells. A study by Iwarson et al. published in the journal Vaccine (1997) confirmed durable immunological memory following hepatitis A vaccination, supporting the case for early and complete immunization before any international trip.
Hepatitis A immunity from a full two-dose series is expected to last approximately 25 years. Hepatitis B protection from a complete three-dose series is considered lifelong for most healthy adults. Completing hepatitis vaccination before departure, meaning both hepatitis A and hepatitis B, is the gold standard of pre-travel liver protection. Booster doses are not routinely recommended unless immunity testing indicates a gap.
When to Get Vaccinated: Timing Your Pre-Travel Preparation
Timing is a central consideration for hepatitis A and B for travelers. The hepatitis A vaccine begins generating protective antibody levels within two to four weeks of the first dose, so the CDC recommends receiving it at least two weeks before departure. Even same-day vaccination before a flight provides meaningful benefit and is still recommended over traveling without any protection at all.
Because of the numerous options for hepatitis B, travelers should plan ahead whenever possible. Scheduling a pre-travel consultation at least 6 to 8 weeks prior to departure – as recommended by the CDC – allows time for maximum protection from both hepatitis A and B. Always check with a travel health specialist who can determine which schedule fits best based on your timeline, destination, and existing vaccination history.
In the United States, hepatitis vaccines are available at travel health clinics, primary care offices, and pharmacies. Travel health clinics offer a key advantage: providers trained specifically in infectious diseases and travel medicine can assess your destination, planned activities, and health history to build a comprehensive vaccination plan, taking into account every risk factor relevant to your trip. This kind of personalized pre-travel consultation is not a luxury, it is best practice for any serious international traveler.
Additional Vaccines and Precautions for International Travellers
Hepatitis A and B are rarely the only vaccines discussed in a pre-travel consultation. Depending on your destination and itinerary, your travel health specialist may also recommend the following.
Yellow fever vaccine: Required for entry to many countries in sub-Saharan Africa and tropical South America, yellow fever is a mosquito-borne viral hemorrhagic fever that can be fatal, and travelers heading to these regions should also review our malaria prevention guide as both threats are common in the same destinations. Yellow fever vaccination must be documented in an official International Certificate of Vaccination or Prophylaxis, and our guide on how far in advance to get the yellow fever jab explains exactly how to time it. TravelBugHealth is a certified yellow fever vaccination center, so you can receive and record this required vaccine in a single visit.
Typhoid vaccine: Recommended for travelers heading to regions where clean water and safe sanitation are not reliably available. Typhoid risk overlaps geographically with hepatitis A risk areas, making both vaccinations especially relevant for overlapping destinations.
Rabies pre-exposure prophylaxis: Consider this vaccine if you plan outdoor activities, animal contact, or extended travel in areas where rabies is present and emergency medical care is not readily accessible. Rabies is fatal once symptomatic, so pre-exposure vaccination is a critical safeguard for high-risk travelers.
Routine vaccinations: Influenza, tetanus, and measles-mumps-rubella vaccines should be current before any international travel. Don’t assume these are already up to date without confirming with your provider.
Our Vaccinations page provides a full list of vaccines we offer and the destinations for which each is recommended.
Frequently Asked Questions
Are hepatitis A and B vaccines required for international travel?
Neither hepatitis A nor hepatitis B vaccine is mandated for entry in most countries. (Yellow fever is the most commonly required vaccine, with specific nations demanding documented proof.) That said, the risk of contracting hepatitis A or hepatitis B during travel is real and entirely preventable, so most travel medicine providers recommend both vaccines as standard care for travelers heading outside the United States to at-risk destinations.
How long does protection from hepatitis vaccines last?
The hepatitis A vaccine provides approximately 25 years of protection after a complete two-dose series. A single dose offers effective shorter-term immunity. The hepatitis B vaccine, following a full three-dose series, is expected to provide lifelong protection for most healthy individuals. Routine boosters are not generally recommended for immunocompetent adults with a documented complete series.
Can I still get vaccinated if I am leaving for my trip very soon?
Yes. Even if your departure is days away, receiving the first dose of the hepatitis A vaccine before you leave provides meaningful protection. Immune response begins within days of vaccination. For hepatitis B, discuss with your travel health specialist which option offers you the quickest and most effective immunity. Make sure you always complete the full vaccine series to ensure long-term coverage.
What is the difference between how hepatitis A and hepatitis B spread?
Hepatitis A spreads through eating or drinking contaminated food or water, particularly in regions where sanitation infrastructure is limited. Hepatitis B spreads through contact with infected blood, unprotected sexual activity, or medical and dental procedures involving non-sterile equipment. Knowing these transmission routes helps travelers take targeted precautions alongside staying current on hepatitis vaccines.
Should travelers with chronic conditions pay special attention to hepatitis risk?
People with chronic liver disease, diabetes, HIV, or other conditions affecting immune function face significantly higher risk of severe complications from both hepatitis A and hepatitis B. Travel medicine specialists strongly advise these travelers to prioritize hepatitis vaccines well in advance and schedule a pre-travel consultation to address all relevant infectious diseases for their specific destinations.
Protect Your Health Before You Board the Plane
Hepatitis A and B for travelers are serious, preventable concerns that deserve a place at the top of every pre-departure checklist. Getting vaccinated before you travel is one of the safest and most effective steps you can take for your health abroad. Contact Us to schedule a pre-travel consultation with our travel health specialists and leave for your next adventure confident and covered.
