Thailand Health and Vaccinations: What You Need to Know

Recommended vaccinations

The following are guidance points — consult a travel health clinic or GP for personalised advice, ideally 6–8 weeks before departure.

Always required (routine):

• MMR (measles, mumps, rubella)
• Diphtheria, tetanus, pertussis (Tdap booster if not current)
• Varicella (chickenpox)
• Polio booster
• Annual influenza

Recommended for Thailand:

• Hepatitis A — transmitted through contaminated food and water. All travellers to Thailand should be vaccinated; the risk from street food and local water is real.
• Typhoid — food and water-borne. Particularly relevant for those eating extensively from street stalls and markets. Oral or injected vaccine available.
• Hepatitis B — transmitted through blood, sexual contact, and medical procedures. Recommended for any stay over a month, or for those with risk factors.
• Japanese Encephalitis — mosquito-borne, viral. Risk is highest in rural areas, near rice paddies and pig farms, during the rainy season (May–October). Recommended for travellers spending significant time in rural areas or northern Thailand. Two doses required, given 28 days apart.
• Rabies (pre-exposure) — not routine but recommended for: extended stays, adventure travel, remote areas, wildlife work, or travellers who may be far from post-exposure treatment. Three doses required. Pre-exposure vaccination means you still need post-exposure doses but buys time to reach adequate medical care.

Not routinely needed:

• Cholera — low risk for travellers staying in standard accommodation.

Malaria

Malaria risk in Thailand is confined to specific areas and is low for mainstream tourist itineraries.

Risk areas:

• Border areas with Myanmar, Laos, and Cambodia — particularly rural forest areas near Tak, Mae Hong Son, Ranong, Kanchanaburi, and Trat provinces
• Some rural areas of southern border provinces

No malaria risk: Bangkok, Chiang Mai, Phuket, Koh Samui, Koh Tao, Koh Phangan, Koh Phi Phi, Krabi, Pattaya, and virtually all standard tourist destinations.

If your itinerary includes border areas or prolonged stays in rural forest regions: consult a travel health clinic about prophylaxis (Malarone/atovaquone-proguanil is commonly prescribed for Thailand). Resistance to chloroquine is widespread in Thailand.

Dengue fever

Dengue is present throughout Thailand and is the most significant mosquito-borne illness risk for travellers. Unlike malaria, dengue cannot be prevented by prophylactic medication.

• Mosquito: Aedes aegypti — bites primarily during the day, especially at dawn and dusk. Also active indoors.
• Peak risk: Rainy season (June–October) when mosquito populations are highest. Risk exists year-round.
• Symptoms: High fever, severe headache, pain behind the eyes, joint and muscle pain, rash. Onset 4–10 days after a bite. Most cases are self-limiting but severe dengue can be life-threatening.
• Prevention: DEET-based repellent (30–50% concentration), long sleeves in forested or rural areas, accommodation with window screens or air conditioning.

There is a dengue vaccine (Dengvaxia) but it’s only recommended for those who have previously had dengue and is not practical for first-time travellers.

Food and water safety

Water: Never drink tap water. Bottled water is ฿7–15 for 1.5L at 7-Eleven and markets. Most guesthouses provide filtered water — confirm before drinking. Ice in established restaurants is generally safe.

Street food: Safe if the turnover is high and the food is cooked hot. Look for stalls with queues of local customers, food cooked to order, and high visible heat. Avoid:

• Pre-cooked food left out at room temperature for extended periods
• Raw shellfish and raw seafood (unless at a reputable restaurant)
• Salads and cut fruit with unclear water provenance in rural areas

Common food-related illness: Traveller’s diarrhoea is the most likely health issue. Pack oral rehydration salts, loperamide (for symptom control), and consider carrying antibiotics (azithromycin or ciprofloxacin — prescribed by your GP before travel) for bacterial gastroenteritis.

Other health considerations

Heat and sun: Thailand is hot year-round; humidity makes exertion taxing. Heatstroke risk is real for those doing active tourism (cycling, hiking, temple visits) in March–May when temperatures peak. Hydrate consistently; avoid peak midday heat for outdoor activities.

Animals: Do not pet or handle monkeys, dogs, or other animals. Monkey bites in tourist areas (Lopburi, Phra Nakhon Khiri) are a genuine rabies exposure risk. Dog bites should be treated immediately — wash the wound thoroughly, seek post-exposure prophylaxis, and contact a hospital. Post-exposure rabies treatment is available at major Thai hospitals (Bangkok Hospital, Bumrungrad, BNH).

Medical care: Bangkok has world-class private hospitals — Bumrungrad International, Bangkok Hospital, BNH — with international standards, English-speaking staff, and direct billing for most travel insurance policies. Outside Bangkok, Chiang Mai, Phuket, and Koh Samui have adequate private hospitals. Remote islands (Koh Tao, Koh Chang) have basic clinics only — serious injuries require evacuation to the mainland.

Sun: UV index is very high year-round (10–12+ in summer). SPF 50 is appropriate; reapply every 2 hours when outdoors.

First aid kit recommendations

• Oral rehydration salts
• Loperamide (imodium)
• Azithromycin (prescription — get before travel for self-treatment of severe gastroenteritis)
• DEET repellent 30–50%
• SPF 50 sunscreen
• Antihistamine
• Basic wound care (antiseptic wipes, plasters, medical tape)
• Tweezers (for sea urchin spines)

Travel health resources

For current outbreak information and country-specific advice:

• CDC Travel Health (US): cdc.gov/travel
• NATHNAC/Travax (UK): travax.nhs.uk
• SMITSKYDDSINSTITUTE (SE) or your national travel health authority