South Asia

South Asia — particularly the Indian subcontinent — carries the world's highest typhoid burden. Salmonella typhi and the increasingly common drug-resistant S. typhi H58 genotype are transmitted via contaminated food and water. Risk is highest during monsoon season (June–September) but present year-round. Both injectable (Vi-polysaccharide) and oral (Ty21a) typhoid vaccines are available — the injectable typhoid-conjugate vaccine (TCV, Typbar-TCV) provides better long-term protection and is recommended where available. Vaccine efficacy is approximately 70–80% — food and water precautions remain essential. See our Food & Water Safety guide.

India accounts for approximately 36% of the world's annual rabies deaths — around 20,000 people per year. Stray dogs are ubiquitous in virtually every city, town, and village across the subcontinent. Monkeys at temple sites are a growing source of bites (Varanasi, Hampi, Vrindavan, Pashupatinath). Post-exposure treatment (RIG + vaccine series) is often unavailable, unreliable, or of uncertain quality in rural South Asia. Pre-exposure prophylaxis (PrEP) — just two doses under the updated CDC 2022 schedule — is strongly recommended for all South Asia travelers, not just trekkers or rural visitors.

The Himalayas include the world's 14 highest peaks — all above 8,000 m. Popular trekking routes in Nepal (Everest Base Camp at 5,364 m, Annapurna Circuit highest point 5,416 m, Langtang), Bhutan (Snowman Trek), and Indian Ladakh (road passes exceeding 5,000 m) carry significant altitude illness risk. AMS affects 25–85% of trekkers depending on ascent rate. HACE and HAPE can be fatal within hours. Acetazolamide (Diamox), proper acclimatisation schedules, a pulse oximeter, and emergency descent medications are essential. See our full Altitude Sickness guide.

South Asia has a mixed malaria profile — both P. vivax (predominant) and P. falciparum are present. Chloroquine-resistant P. falciparum occurs across the region. Risk varies enormously by country and destination: urban India (major cities) and Sri Lanka (most tourist areas) have low risk, while rural India, Nepal Terai, Bangladesh, and Pakistan have higher risk. Major cities (Delhi, Mumbai, Kathmandu) have low malaria risk. Himalayan altitudes above 2,000 m are malaria-free. Antimalarial prophylaxis should be prescribed based on specific itinerary. See our Malaria Prevention guide.

Dengue is hyperendemic across South Asia — India, Sri Lanka, Bangladesh, Pakistan, and Nepal all report significant annual outbreaks. Notably, dengue is an urban and suburban risk as much as a rural one — major cities including Delhi, Mumbai, Colombo, Dhaka, and Kathmandu report large outbreaks. The Aedes aegypti mosquito bites during the day — daytime DEET application is essential across the region year-round. Peak season typically coincides with and follows monsoon (July–November).

TD rates of 30–50% affect visitors to South Asia — among the highest in the world. The region's extraordinary street food culture, which is integral to the travel experience, combined with challenging food safety infrastructure makes this risk unavoidable without careful precautions. Hepatitis A vaccine is strongly recommended. Cholera outbreaks occur, particularly in Bangladesh, India (West Bengal), and Nepal. Carry azithromycin as a standby antibiotic — fluoroquinolone resistance is widespread throughout the Indian subcontinent.

Delhi, Lahore, and Dhaka regularly rank among the world's most polluted cities — particularly during winter (November–February) when crop burning, cold weather inversions, and vehicle/industrial emissions combine to produce PM2.5 levels 20–30 times WHO safe limits. Travelers with asthma, COPD, cardiac disease, or respiratory conditions face real health risk from extended outdoor exposure. Carry N95 masks (not surgical masks — PM2.5 requires N95 filtration) and extra respiratory medication. Monitor AQI apps before outdoor activity.

Japanese Encephalitis (JE) is transmitted by night-biting Culex mosquitoes in rural agricultural areas — rice paddies and pig farming zones across India, Nepal, Sri Lanka, Bangladesh, and Pakistan. Risk is highest during and after monsoon season in these rural settings. The JE vaccine (Ixiaro — 2 doses) is recommended for rural travel, extended stays, and adventure trekking in South Asia. Minimal risk in urban tourist environments.

The Indian subcontinent experiences extreme heat from March through June — the pre-monsoon season. Rajasthan, Pakistan, and parts of Bangladesh regularly record temperatures exceeding 48–50°C, with deadly heat waves killing thousands annually. India's 2015 heat wave killed over 2,500 people. This period is not recommended for outdoor sightseeing in northern India and Pakistan. Stay hydrated aggressively, avoid midday outdoor exposure, and recognise heat stroke as a medical emergency.

Leptospirosis risk increases significantly during and after monsoon floods — particularly in low-lying areas of Bangladesh, coastal India, Sri Lanka, and Nepal's Terai. Avoid wading through floodwater. Visceral leishmaniasis (Kala-azar) is endemic in Bihar (India), Bangladesh, and Nepal Terai. Cysticercosis risk from undercooked pork in Hindu/Buddhist communities is lower than in Latin America but present. Brucellosis through unpasteurised dairy is present across the region.

Get Pre-Exposure Rabies Vaccine

This is the single most important additional vaccine for South Asia that many US travelers skip. Dog bites are common across the region — at temples, on treks, in markets. Rabies immune globulin (RIG), required for post-exposure treatment if unvaccinated, is frequently unavailable or of unreliable quality in rural South Asia. The 2-dose pre-exposure series is inexpensive and saves lives. Get it.

Plan Trekking Acclimatisation Carefully

The Everest Base Camp and Annapurna Circuit treks are not casual hikes — they require careful medical preparation. Book with reputable operators who follow conservative acclimatisation schedules. Carry a pulse oximeter and know the HACE ataxia test. Obtain acetazolamide and emergency descent medications before you leave the US — they may be unavailable or counterfeit in Kathmandu. Never trek alone above 4,000 m.

Navigate Food Safety Strategically

South Asian street food is extraordinary — and navigating it safely is achievable. Eat freshly cooked food served hot. Avoid salads, pre-cut fruit, and tap water in all forms (including ice and drinks made with tap water). Avoid raw or undercooked seafood — particularly in coastal India and Bangladesh. In Nepal trekking lodges, food safety is variable — choose freshly cooked dal bhat over cold or pre-prepared dishes. Carry your azithromycin prescription.

Monitor Air Quality — North India

If traveling to Delhi, Agra, Varanasi, or any north Indian city between November and February, download an AQI app (IQAir, AirVisual) and check pollution levels before outdoor sightseeing. On high-pollution days (AQI >300 — "Hazardous"), limit outdoor exposure and wear N95 masks. Asthma and cardiac patients should be particularly cautious and carry extra medication.

Bottled or Purified Water — Always

Tap water is unsafe across virtually all of South Asia. Use sealed bottled water or your own purification system for drinking and teeth brushing. On treks, carry UV purification and filter options — water sources above teahouses may look clean but carry enteric pathogens. Never accept cold drinks with ice in local restaurants or roadside stalls.

Road Traffic — The Most Common Cause of Death

Road traffic injury is statistically the leading cause of death among travelers in South Asia — not infectious disease. India has the world's highest absolute road traffic death toll. Traffic drives on the left (India, Sri Lanka, Nepal, Pakistan, Bangladesh). Roads are crowded, chaotic, and standards vary enormously. Avoid night driving. Always wear helmets on motorcycles. Use reputable private car services rather than auto-rickshaws on highways.

Monsoon Travel — Added Risks

The South Asian monsoon (June–September) dramatically increases infectious disease risk — particularly dengue, typhoid, leptospirosis, and cholera. Flooding disrupts sewage systems and contaminates water supplies. Trek routes in Nepal become more hazardous (landslides, flooded rivers). However, the Monsoon also makes India's landscapes extraordinarily beautiful — if you travel in monsoon, simply heighten all food, water, and mosquito precautions significantly.

Know Where to Go If You Get Sick

Research the nearest quality private hospital before you need it. In India: Apollo, Fortis, Max, and AIIMS (Delhi) are world-class. In Nepal: Ciwec Clinic and Norvic Hospital in Kathmandu are recommended for travelers. In Sri Lanka: Asiri and Nawaloka hospitals in Colombo. Avoid public hospitals where possible — private facilities are essential for serious illness. Medical evacuation insurance is critical for trekking itineraries.

South Asia

🇦🇫 Afghanistan

US State Department Level 4 — Do Not Travel. Ongoing conflict and Taliban control make Afghanistan one of the world's most dangerous destinations for US citizens. Malaria (both P. vivax and P. falciparum) is widespread. Afghanistan is one of the last two countries with endemic wild poliovirus — polio booster essential. Typhoid and rabies risk very high. No functioning healthcare infrastructure for foreign nationals. Travel is not recommended under any circumstances for US citizens.

South Asia

🇧🇩 Bangladesh

Dengue outbreaks in Dhaka are among the world's most severe — a major outbreak in 2023 caused thousands of deaths. Typhoid and hepatitis A risk very high. Malaria in Chittagong Hill Tracts (southeastern border area). Cholera outbreaks occur particularly during and after flooding. Rabies endemic. Air pollution in Dhaka is extreme in winter. Tap water unsafe throughout. Limited private healthcare in Dhaka. Popular for Sundarbans mangrove eco-tourism and Cox's Bazar beach.

South Asia

🇧🇹 Bhutan

Bhutan is one of the world's most exclusive travel destinations — requiring a Sustainable Development Fee (SDF) per day which limits tourist volumes and funds excellent guided trekking. Altitude risk is significant — Snowman Trek reaches 5,320 m, and all treks involve significant altitude gain. Malaria exists in lowland southern Bhutan (Paro Valley is generally safe at 2,200 m). Rabies and typhoid precautions needed. Thimphu has basic private healthcare — medical evacuation to India required for serious illness.

South Asia

🇮🇳 India

The world's most populous country and one of its most medically complex travel destinations. Typhoid burden is extraordinary — carry your vaccine certificate. Rabies deaths: India accounts for 36% of the global total — pre-exposure rabies vaccine is strongly recommended for all India visitors. Dengue outbreaks in Delhi, Mumbai, Chennai, and Kolkata every year. Malaria risk varies by state — rural eastern states (Odisha, Chhattisgarh, Jharkhand) have highest burden. Air quality in north India (October–March) is a genuine health hazard. Food safety is highly variable — "Delhi Belly" is a real and very common experience. World-class private hospitals (Apollo, Fortis, AIIMS) in major cities. Ladakh and Himalayan regions: significant altitude risk (see trekking section). Traffic on the left.

South Asia / Indian Ocean

🇲🇻 Maldives

One of South Asia's lowest health risk destinations for tourists. Malaria-free. No yellow fever risk. Dengue present on inhabited local islands — resort islands have lower risk. Food safety on resort islands is excellent — local islands have variable standards. The primary health risk is marine — jellyfish, reef fish spines, and diving decompression illness. Ensure your dive insurance covers decompression chamber treatment. Healthcare outside Male is very limited — medical evacuation to India or Sri Lanka for serious illness. Tap water in Male is unsafe; resort islands use desalinated water.

South Asia

🇳🇵 Nepal

The world's premier trekking destination — home to 8 of the world's 14 highest peaks. Altitude sickness is the primary concern for the majority of visitors. EBC and Annapurna Circuit treks reach above 5,000 m and require careful preparation (see altitude section above). Typhoid risk is very high — Nepal has one of the world's highest per-capita typhoid burdens. Dengue in Kathmandu Valley and Terai. Malaria in Terai lowlands (near Indian border) — not at trekking altitudes. Rabies widespread — temple monkeys (Pashupatinath, Swayambhunath) bite tourists regularly. Ciwec Clinic and Norvic in Kathmandu are recommended for travelers. Very limited care on trekking routes — carry comprehensive medical kit.

South Asia

🇵🇰 Pakistan

Pakistan is one of the last two countries with endemic wild poliovirus — polio booster is essential. Typhoid and hepatitis A risk very high throughout. Malaria across most of the country outside of Islamabad and Karachi where risk is lower. Dengue outbreaks in Lahore and Karachi are significant. Extraordinary mountaineering destination — Karakoram range includes K2 (8,611 m) and six other 8,000 m peaks. Extreme heat in Punjab and Sindh (May–June). Security situation is variable — check US State Dept advisories carefully, particularly for Khyber Pakhtunkhwa, FATA, and Balochistan. Good private hospitals in Islamabad and Lahore. Air pollution is severe in Lahore in winter.

South Asia / Indian Ocean

🇱🇰 Sri Lanka

One of South Asia's most accessible and popular tourist destinations — Sigiriya, Kandy, beaches, wildlife safaris. Dengue is the primary health risk — hyperendemic throughout the country, with Colombo, Gampaha, and Kandy regularly experiencing large outbreaks. Malaria has been dramatically reduced — risk now very low and limited to certain northern border areas near Vavuniya. Typhoid and hepatitis A recommended. Rabies endemic — stray dog populations are significant. Food safety is better than India in tourist areas but precautions still needed. Good private hospitals in Colombo (Asiri, Nawaloka, Lanka). Traffic on the left.