Summary of recommendations
All travelers should visit either their personal physician or a travel health clinic 4–8 weeks before departure.
Malaria: Prophylaxis with atovaquone/proguanil (Malarone) or doxycycline is recommended for rural areas bordering Cambodia, Laos, and Myanmar, including Mae Hong Son. Rare local cases have been reported from Phang Nga and Phuket; insect protection measures are advised, but malaria pills are not generally recommended for these two areas.
Vaccinations
| Vaccine | Who should consider it |
|---|---|
| Hepatitis A | Recommended for all travelers |
| Typhoid | For travelers who may eat or drink outside major restaurants and hotels |
| Yellow fever | Required for travelers aged 1 year or older arriving from a yellow-fever-risk area in Africa or the Americas, and for travelers who have transited through an airport in a country with yellow fever risk (often when transit time exceeds local thresholds). Not recommended or required otherwise. |
| Japanese encephalitis | For travelers spending a month or more in rural areas, and for shorter trips with substantial evening outdoor exposure in rural/agricultural areas |
| Hepatitis B | Recommended for all travelers |
| Rabies | For travelers with high animal exposure risk, frequent outdoor activity, remote travel, or potential bat contact |
| Measles, mumps, rubella (MMR) | Two doses for travelers born after 1956 if not previously given |
| Tetanus-diphtheria | Booster recommended every 10 years |
Medications
Travelers’ diarrhea is the most common travel-related ailment. The cornerstone of prevention is food and water precautions. Many travelers carry an antibiotic and an anti-diarrheal medication for self-treatment if significant diarrhea occurs (for example, three or more loose stools in 8 hours or five or more loose stools in 24 hours), especially when accompanied by nausea, vomiting, cramps, fever, or blood in the stool.
Most cases are mild and do not require antibiotics. Adequate hydration is essential. Seek medical attention if diarrhea is severe or bloody, if high fever occurs, if abdominal pain is marked, or if symptoms persist beyond 72 hours.
Malaria prophylaxis is recommended for rural, forested areas that border Myanmar, Cambodia, and Laos. There is no malaria risk in major tourist resorts or in the cities of Bangkok, Chiang Mai, Chiang Rai, Pattaya, Ko Samui, and Ko Phangan.
Immunizations
The following are commonly recommended vaccinations for Thailand:
- Hepatitis A: generally recommended for travelers over 1 year of age.
- Typhoid: often recommended, especially for broader food exposure.
- Japanese encephalitis: consider for longer rural exposure or significant outdoor evening activity.
- Hepatitis B: recommended for travelers who are not previously vaccinated.
- Rabies: consider for high-risk activities, remote travel, or prolonged stays.
- Tetanus/diphtheria: booster every 10 years.
- MMR: ensure two-dose protection where appropriate.
- Yellow fever: required only in specific entry/transit circumstances; otherwise not required.
Recent outbreaks
Outbreak reports vary over time. Examples of conditions that have been reported in Thailand include hand, foot, and mouth disease, leptospirosis after freshwater exposure (often during rainy season and flooding), and mosquito-borne illnesses such as dengue and chikungunya.
For most travelers, the practical takeaway is to follow insect-bite prevention, use sensible food/water precautions, and seek medical care promptly for fever during or after travel.
Other infections
- Zika: mosquito-borne; special consideration for pregnancy planning.
- Scrub typhus / rickettsial infections: associated with rural/outdoor exposure.
- Schistosomiasis: risk from freshwater exposure in certain settings (varies by area).
- Hepatitis E: food/water-borne; higher risk in pregnancy.
Food and water precautions
Avoid tap water unless boiled, filtered, or chemically disinfected. Avoid unpasteurized dairy. Eat fruits and vegetables only if peeled or cooked. Avoid buffets where food sits at room temperature and avoid raw or undercooked meat or fish. Consider avoiding street vendors if you are risk-averse or have limited tolerance for illness during the trip.
Insect and tick protection
- Wear long sleeves and long pants in higher-risk areas.
- Use insect repellent (DEET or picaridin) on exposed skin as directed.
- Consider permethrin-treated clothing for additional protection.
- Use screens/air conditioning; use bed nets if accommodation allows mosquito entry.
- Do tick checks after outdoor exposure in rural/forested areas.
Air pollution
Air quality can be a significant health issue in Bangkok and Chiang Mai at times. Travelers with respiratory or cardiac conditions and those who are elderly or very young may be more susceptible. Risk can be reduced by staying indoors on poor-air days, avoiding outdoor exercise, and maintaining hydration.
General advice
Bring adequate supplies of routine medications in original containers. Carry a brief clinician letter listing medical conditions and medications (generic names). Keep essential medications in carry-on luggage and consider a backup supply.
Confirm your health insurance covers medical care abroad. Consider supplemental travel medical insurance and medical evacuation coverage when appropriate. Significant illness abroad can be expensive.
Ambulance and emergency services
For a public ambulance in Thailand, call 1669. Response time is often faster in cities than rural areas. Private ambulance services may be available through major hospitals in Bangkok.
Medical facilities
Excellent medical care is available in Bangkok. Outside Bangkok, quality can be variable and English-speaking services may be harder to find.
Doctors and hospitals may expect payment at time of service, regardless of insurance coverage. Serious illness may require medical evacuation in rare cases.
Traveling with children
Ensure routine childhood vaccines are up to date. Children may require accelerated schedules depending on age and itinerary. Discuss malaria prevention (where relevant) and insect-bite protection strategies carefully, including age-appropriate repellents.
Travel and pregnancy
Pregnancy changes risk tolerance for infections, medications, and access to care. Travel should be planned with a clinician, particularly when destinations include malaria-risk areas or when medical access may be limited.
Embassy/consulate location
U.S. travelers should review current embassy guidance and consider enrolling in traveler update programs where available. Include the U.S. Embassy contact details relevant to Thailand here.
Safety information
For current safety and security guidance, refer to official government travel advisories (U.S. Department of State and other relevant national authorities).