Travel Health Guide: Sri Lanka — Dengue, Rabies, Tea-Country Stomach Bugs, and the Vaccines Most Travelers Skip

Sri Lanka is one of the highest-value travel destinations in South Asia for US visitors right now: tea country in the hills, leopards in Yala, surf on the south coast, ancient ruins in the cultural triangle, and a price point most travelers find shockingly reasonable. The health profile is more nuanced than most people expect. According to the Centers for Disease Control and Prevention (CDC), the top travel-related health risks in Sri Lanka are dengue fever, traveler's diarrhea, rabies exposure from stray dogs and monkeys, and hepatitis A from contaminated food and water. Japanese encephalitis is a risk for travelers spending time in rural rice-growing regions, especially during and just after the monsoon. Malaria is no longer transmitted locally (the World Health Organization certified Sri Lanka malaria-free in 2016), but imported cases still occur and the country actively monitors for reintroduction.

This guide walks through what you actually need, by region and trip type, with the vaccines worth the visit, the medications worth packing, and the mistakes our clinicians see Sri Lanka travelers make most often.

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Quick answer: do I need vaccines and medications for Sri Lanka?

For most US travelers visiting Sri Lanka, the recommended pre-trip plan looks like this:

1. Confirm routine vaccines are up to date — measles, mumps, rubella (MMR), tetanus-diphtheria-pertussis (Tdap), varicella, polio, and the seasonal flu shot.
2. Hepatitis A is recommended for essentially all travelers because exposure happens through food and water, both unavoidable.
3. Typhoid is recommended for most travelers, particularly anyone eating outside resort kitchens, traveling rurally, or staying with friends and family.
4. Hepatitis B is recommended for longer stays, anyone receiving medical or dental care, getting tattoos or piercings, or potential sexual contact.
5. Rabies pre-exposure vaccination is worth considering, especially for cyclists, runners, kids, longer-term travelers, and anyone heading to rural areas where post-exposure rabies treatment is harder to access.
6. Japanese encephalitis is recommended if you'll spend a month or more in rural areas, or shorter periods with significant outdoor exposure in rice-paddy regions during transmission season.
7. A prescription antibiotic for traveler's diarrhea (typically azithromycin) is the highest-impact prescription you can bring. Plan for it before you go.
8. No malaria pills are needed. Sri Lanka is currently malaria-free.

For vaccines like hepatitis A, typhoid, rabies, and Japanese encephalitis, Wandr books your appointment at a partner pharmacy. For prescription medications like azithromycin or scopolamine, our clinicians call the prescription in to your local pharmacy for pickup. The two flows are separate; you do not need a clinic visit for either.

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Sri Lanka, by region — what changes about the health picture

The country is small enough that travelers underestimate how different the health environment is from one region to the next. A long weekend in Galle is not the same risk profile as ten days in Anuradhapura.

Colombo and the west coast

The capital and the cluster of beach resorts running south to Bentota. Dengue transmission is year-round and the urban Aedes mosquito (the dengue vector) bites during daylight, not at dusk like the malaria mosquito Americans usually associate with the tropics. Food and water risk is moderate in established hotels and resorts and meaningfully higher at roadside stalls, small cafes, and any place ice is added to drinks.

South coast (Galle, Mirissa, Weligama, Tangalle)

Peak season is December through March. Surf, beach, whale watching from Mirissa, the colonial fort at Galle. Same dengue risk as the west coast and a higher rate of cuts, abrasions, and surf injuries that can get infected in warm seawater. Rabies risk shows up here in the form of beach dogs and macaques near tourist sites.

Cultural triangle (Sigiriya, Polonnaruwa, Anuradhapura, Dambulla)

The historic core. Walking outdoors for hours, often at midday. Heat illness is real, and the monkeys at temple sites bite and scratch tourists every week. Aukana, Anuradhapura, and the inland heritage zones are also Japanese encephalitis territory if you are spending significant time outdoors at dusk during transmission season.

Hill country (Kandy, Nuwara Eliya, Ella, Hatton)

Tea plantation country, the train ride from Kandy to Ella, cooler temperatures (down to 50°F at night in Nuwara Eliya), waterfalls and hiking. Lower dengue risk because the mosquito vector doesn't thrive at altitude, but leptospirosis risk is real if you swim in waterfall pools or freshwater streams. Stomach bugs are common because travelers relax their food hygiene in cooler weather. Adam's Peak and other hill walks involve early-morning starts where street dogs cluster around food stalls.

East coast (Trincomalee, Arugam Bay, Batticaloa)

Peak season is May through September (the opposite of the south coast). Dengue is endemic. Arugam Bay surf injuries and beach dog encounters are common reasons travelers return needing care. The east coast is also one of the regions where Japanese encephalitis cases have been reported.

Yala, Wilpattu, and the safari belt

Leopards, elephants, sloth bears, jackal. Outdoor exposure during dawn and dusk drives the bite count. Bring repellent with at least 20 percent DEET. The risk of malaria is essentially zero locally, but if you have been in any malaria-endemic country in the previous month, this is the kind of trip where a fever afterward should always trigger a malaria test.

Jaffna and the north

Cultural and historical travel, far less developed tourist infrastructure, longer drive times, fewer reliable medical facilities. Heightened importance of rabies pre-exposure vaccination, a well-stocked first-aid kit, and a clear plan for what to do if something happens.

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The vaccines worth getting before you go

Hepatitis A — the single highest-yield travel vaccine for Sri Lanka

Hepatitis A is endemic in Sri Lanka and transmits through contaminated food and water. It causes weeks of debilitating illness (fatigue, nausea, jaundice, abdominal pain) and there is no specific treatment, only supportive care. The CDC recommends the hepatitis A vaccine for all US travelers to Sri Lanka who are unvaccinated. A single dose provides protection in two to four weeks; a second dose six to twelve months later gives long-term immunity. Most adults under 50 born and raised in the US have not had this vaccine because it was only added to the routine US childhood schedule in the late 1990s.

Typhoid — recommended for most travelers

Typhoid fever is caused by Salmonella Typhi and transmits through contaminated food and water. The CDC recommends typhoid vaccination for travelers to South Asia, including Sri Lanka. Two formulations exist: an injectable polysaccharide vaccine (Typhim Vi) that protects for two years, and an oral live-attenuated vaccine (Vivotif) that protects for five years and is taken as four capsules over a week. The oral version is not appropriate for everyone (immunocompromised travelers, pregnant women, anyone on antibiotics during the dosing window) so the injection is the default in most cases.

Hepatitis B — recommended for many travelers

If you were born after the early 1990s in the US, you were probably vaccinated as a child. Many older travelers were not. Hepatitis B transmits through blood and body fluids, which means medical or dental care, accidents requiring transfusion or stitches, tattoos, piercings, and sexual contact are all routes. The vaccine is a three-dose series given over six months, though accelerated schedules exist if you are short on time.

Rabies pre-exposure — worth a conversation for most travelers

This is the vaccine US travelers most often skip and most often regret. Sri Lanka has a high stray dog population and frequent macaque-human interactions at temples and beaches. Post-exposure rabies treatment in Sri Lanka requires multiple doses of rabies immunoglobulin plus four doses of rabies vaccine, and immunoglobulin can be hard to source outside Colombo. Travelers who received pre-exposure vaccination (two doses, day 0 and day 7) skip the immunoglobulin entirely after a bite and only need two booster doses. The CDC specifically calls out children, runners, cyclists, cavers, animal workers, and long-stay travelers as the populations who should consider it. In practice, anyone going to Sri Lanka for more than two weeks should at least price the conversation.

Japanese encephalitis — for rural and longer-stay travelers

Japanese encephalitis is a mosquito-borne viral infection that affects the brain. Most infections cause no symptoms, but the small percentage that progress to encephalitis carry a mortality rate of 20 to 30 percent and leave half of survivors with permanent neurologic damage. The vaccine is recommended by the CDC for travelers who will spend at least a month in endemic areas, or shorter stays with significant rural outdoor exposure, especially during transmission season. In Sri Lanka, transmission peaks during and after the monsoon (October through January in the north and east, May through September in the south and west).

Cholera and yellow fever — usually not needed

Cholera is not a typical travel risk in Sri Lanka for short-term US travelers, though a single-dose oral vaccine exists for higher-risk situations. Yellow fever is required only if you are arriving from a country with risk of yellow fever transmission (much of sub-Saharan Africa and parts of South America). If your trip is direct from the US, you do not need it.

Routine vaccines

Confirm MMR, Tdap (within the last 10 years), varicella, polio, and the seasonal flu shot. Sri Lanka has had measles outbreaks, and Tdap is the most commonly out-of-date adult vaccine we see.

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The medication you should bring, in order of importance

1. An antibiotic for traveler's diarrhea (azithromycin)

Traveler's diarrhea hits an estimated 30 to 70 percent of travelers to South Asia, depending on how you eat and where you stay. The standard first-line antibiotic for Sri Lanka and the broader region is azithromycin (commonly 1,000 mg as a single dose, or 500 mg daily for three days, depending on severity). Ciprofloxacin used to be standard but resistance is now widespread in South Asia, which is why physicians who actually treat travelers from this region recommend azithromycin first. Imodium (loperamide) is helpful in combination for symptom control during travel days.

Wandr can have azithromycin called in to your local pharmacy before you leave, so it is in your bag when the bug hits, not something you go scrambling to find at a Colombo pharmacy at 2 AM.

2. Oral rehydration salts

Two packets in your bag. The fastest way to feel less terrible after a rough night with TD is rehydration with electrolytes. Coconut water is everywhere in Sri Lanka and works in a pinch.

3. A motion sickness option

Sri Lanka involves a lot of winding mountain roads. The Kandy-to-Ella train is beautiful and also lurches. The southern coast highway is fine; the inland routes are not. If you know you are sensitive, ask Wandr's clinicians about scopolamine (the patch behind the ear, used 6 hours before travel) or a non-drowsy option like ondansetron.

4. Strong insect repellent

DEET 20 to 30 percent or picaridin 20 percent. Permethrin-treated clothing for safari and rural areas. Dengue mosquitoes bite during the day. Japanese encephalitis mosquitoes bite at dusk and dawn. The window of risk is essentially "any time you are outside."

5. Sunscreen and an aloe option

Sri Lanka is close to the equator. UV is intense. Reef-safe SPF 30+ is the minimum, and a small aloe gel pays for itself the first time someone in your group falls asleep on the beach.

6. A basic first-aid kit

Bandaids, gauze, antiseptic, blister care for hiking, tweezers, antihistamine, an antifungal cream for the inevitable heat rash. Beach scratches and tropical cuts get infected fast in warm humid weather.

7. Optional: traveler's anxiety or sleep aid for the flight

Sri Lanka is 15 to 17 time zones from most of the US depending on where you start, and there are no nonstop flights from North America. Most travelers connect through the Middle East or Asia and lose two full nights of sleep before they arrive. A short course of a sleep aid for the flight (or for the first two nights on arrival) can be the difference between losing four days and losing one.

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Dengue fever: the risk most Sri Lanka travelers do not take seriously enough

Dengue is the single most common imported infection from Sri Lanka to the US. The country had major outbreaks in 2017 and again in 2023, and transmission continues every year. The mosquito that carries dengue (Aedes aegypti) lives in urban areas, bites during the day, and breeds in containers of standing water (flowerpots, tires, water buckets, the rims of trash cans). There is no medication that prevents dengue.

The current dengue vaccine (Qdenga) is licensed in some countries but is not currently routinely available or recommended for short-term US travelers, partly because the vaccine has a complex safety profile in people who have never had dengue. Prevention is mosquito avoidance, and it has to be aggressive.

Symptoms typically start three to seven days after a bite:

• High fever, often abrupt
• Severe headache, often behind the eyes
• Muscle and joint pain ("breakbone fever")
• Rash, often appearing two to five days into the illness
• Nausea and vomiting

Most cases resolve in a week with rest, fluids, and acetaminophen (paracetamol). Do not take ibuprofen or aspirin if you suspect dengue: both can worsen bleeding complications. A small percentage of cases progress to severe dengue with internal bleeding and shock; this requires hospital care and IV fluids. If you develop a high fever during or within two weeks of returning from Sri Lanka, get evaluated and tell the doctor you were in a dengue-endemic area.

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Rabies: the no-second-chance disease

Rabies kills nearly 100 percent of people who develop symptoms. Sri Lanka has a high stray dog population and frequent rabies cases in dogs every year. Cats, monkeys, and bats can also transmit. The good news is that rabies is 100 percent preventable if treated correctly after exposure, before symptoms start. The bad news is that "correctly" means rabies immunoglobulin (RIG) plus a four-dose vaccine series, and RIG is in short supply globally and not always available outside Colombo.

If you are bitten or scratched by any mammal in Sri Lanka:

1. Wash the wound immediately with soap and running water for at least 15 minutes. This single step reduces rabies risk dramatically.
2. Apply an antiseptic if you have it.
3. Seek medical care the same day, even if the wound looks minor.
4. Call your travel insurance. They can help you find a facility that has rabies immunoglobulin in stock if you did not receive pre-exposure vaccination.

Tell your provider you were in Sri Lanka. The animal rabies status in the country is high enough that post-exposure prophylaxis is essentially always indicated for unvaccinated travelers after a bite or scratch from a mammal, even a tiny one.

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Food and water in Sri Lanka — what actually works

The standard CDC advice (boil it, cook it, peel it, or forget it) is more conservative than most travelers stay in practice. What experienced travelers and physicians actually do:

• Bottled or filtered water only, including for brushing teeth. Major resorts often provide safe water; smaller guesthouses often do not.
• Ice is the silent killer. Restaurant ice is often made from tap water. Skip ice in drinks at smaller establishments. Resorts using filtered ice are usually fine, but the rule of "ice always" exists for a reason.
• Fruit you peel yourself is safe. Fresh-cut fruit on display, washed in tap water, is not.
• Eat at busy, hot restaurants. High turnover equals food that has not been sitting out. This is more reliable than "expensive equals safe."
• Street food at busy, hot stalls is often safer than buffet food at a tired hotel. Heat is the cleansing factor. If it is cooked in front of you and immediately served, it is generally fine.
• Be cautious with seafood at non-coastal restaurants and with raw foods (salads, raw vegetables) at smaller establishments.
• Tea is everywhere and almost always safe. It is made with boiled water by definition.

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Other risks worth knowing about

Leptospirosis

A bacterial infection contracted through skin contact with water contaminated by animal urine. Risk is highest after heavy rains, in flooded areas, and in freshwater pools and rivers. Avoid wading or swimming in freshwater after flooding. If you develop fever, headache, and muscle aches a week or two after freshwater exposure, mention it to your doctor.

Heat illness

Sri Lanka is hot and humid. The cultural triangle in particular involves long walks with little shade. Hydrate aggressively (a liter of water per hour outdoors in midday heat is not excessive), wear loose light-colored clothing, and pace yourself. Heat exhaustion and heatstroke are real risks that send travelers home early every year.

Sun and surf

The south and east coasts are world-class surf. Reef cuts on shallow Sri Lankan reefs get infected quickly because of warm water and the bacterial load. Wash cuts immediately with bottled water and antiseptic, apply antibiotic ointment, and watch them closely for redness or swelling. See a doctor if a cut shows signs of infection.

Road safety

Road traffic accidents are the leading cause of preventable death for US travelers worldwide, and Sri Lanka is no exception. Tuk-tuks are everywhere, fun, and not particularly safe. Hire a driver for long trips. Avoid driving yourself unless you have experience with chaotic right-hand-drive traffic.

Medical care

Private hospitals in Colombo (Asiri, Lanka, Nawaloka) are excellent for routine care. Outside Colombo, facilities vary widely. Travel insurance with medical evacuation coverage matters more in Sri Lanka than in most South Asian destinations because the infrastructure for serious cases (major trauma, ICU-level illness) is concentrated in the capital.

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What to do four to six weeks before you fly

1. Schedule travel health prep with Wandr. A pre-trip check confirms which vaccines you actually need based on routes, accommodations, and how long you are staying.
2. Book your vaccine appointment. Some vaccines (rabies pre-exposure, Japanese encephalitis, hepatitis B) require a multi-dose series. Starting four to six weeks out gives you time.
3. Get your prescription medications called in to your local pharmacy. Azithromycin, oral rehydration salts, motion sickness options, anything else you might need.
4. Buy travel insurance with medical evacuation coverage. Read what it covers. If it doesn't include evacuation, look elsewhere.
5. Stock a first-aid kit with the basics above.
6. Check your routine vaccines. MMR and Tdap especially.
7. Plan a sleep strategy for the inbound flight and the first two nights.

Start with a free pre-trip health check at travelwithwandr.com

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What to do once you arrive

• Apply repellent at sunrise, not just at dusk. Dengue is a daytime disease.
• Use bottled water for drinking, brushing, and rinsing cuts until you have a sense for the safety of your accommodation's water.
• Watch your food intake the first two days. Most travel TD shows up on day two or three. Eat clean, hot, simple food while your stomach adjusts.
• If a dog or monkey approaches food in your hand, drop the food and back away slowly. Do not run. Macaques at temples will grab food and sometimes the hand attached to it.
• Keep a card with your hotel name and a local emergency number in your wallet. Suwa Seriya (1990) is Sri Lanka's free national ambulance service.

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What to do if you get sick during the trip

For mild traveler's diarrhea: start oral rehydration. If symptoms are moderate (more than three loose stools in 24 hours, fever, blood in stool), start the azithromycin Wandr prescribed. Pair it with loperamide for a long bus or train day.

For fever of any kind starting more than three days into the trip: treat it as possible dengue until proven otherwise. Acetaminophen for fever, no ibuprofen or aspirin, and get evaluated at a private hospital. A simple rapid test can confirm or rule out dengue.

For an animal bite or scratch: wash with soap and running water for 15 minutes, get to a hospital the same day, ask specifically about rabies post-exposure prophylaxis. Tell them whether you had pre-exposure vaccination.

For anything that feels seriously wrong: go to a private hospital in Colombo if you can get there. Asiri, Lanka, and Nawaloka are reliable. Have your travel insurance documents handy.

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What to watch for when you get home

Most travel-related illnesses show up within two weeks of returning, but dengue specifically can appear days after you land. The infections to watch for after Sri Lanka:

• Fever within two weeks of return: get evaluated, mention Sri Lanka
• Persistent diarrhea lasting more than a week: get evaluated, may need stool testing
• A bite or scratch that wasn't fully treated: finish the rabies series even after you are home if you started one abroad
• Jaundice (yellowing of skin or eyes): possible hepatitis A or B, get tested
• Skin sores or unusual rashes: worth a visit to your primary care doctor

A primary care doctor with experience in returned-traveler medicine, or a travel medicine clinic, is the right call if anything feels off in the four weeks after a trip to Sri Lanka.

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Frequently asked questions

Do I need malaria pills for Sri Lanka?

No. Sri Lanka was certified malaria-free by the World Health Organization in 2016 and no local transmission has occurred since. The country actively monitors for reintroduction and treats imported cases. Travelers who recently visited a malaria-endemic country before Sri Lanka should still consider their risk.

What vaccines do I need for Sri Lanka from the US?

For most US travelers: hepatitis A and typhoid, plus routine vaccines (MMR, Tdap, polio, varicella, flu). Hepatitis B, rabies pre-exposure, and Japanese encephalitis are recommended for specific risk profiles (longer stays, rural exposure, animal contact, medical care abroad).

Is dengue fever common in Sri Lanka?

Yes. Dengue is endemic year-round in Sri Lanka with peaks during and after the monsoons. Tens of thousands of cases are reported annually and travelers from the US are diagnosed with dengue after Sri Lanka every year. Mosquito avoidance is the only prevention.

Can I drink tap water in Sri Lanka?

No, not as a routine. Bottled or filtered water is the standard recommendation for drinking, brushing teeth, and rinsing food. Boiled water is fine. Filtered water from a reliable source is fine. Hotel-supplied "drinking water" carafes are usually safe at established properties but not always at smaller guesthouses.

How risky is rabies in Sri Lanka?

Sri Lanka has an active rabies presence in stray dogs and other mammals. Any bite or scratch from a mammal should be treated as a potential rabies exposure. Pre-exposure vaccination is worth considering for travelers spending more than a couple of weeks, anyone with significant outdoor exposure, and anyone traveling with kids.

Do I need a yellow fever vaccine for Sri Lanka?

Only if you are arriving from a country with risk of yellow fever transmission (parts of Africa and South America). If you are flying directly from the US or via Europe or the Middle East, no yellow fever vaccine is required.

When is the safest time to visit Sri Lanka health-wise?

The dry seasons by coast (December through March for the south and west, May through September for the east) usually have lower dengue and Japanese encephalitis transmission. That said, both diseases occur year-round and prevention is more important than timing.

Should I bring an antibiotic for traveler's diarrhea?

Yes, almost always. The standard recommendation for South Asia is azithromycin, prescribed in advance so it is in your bag when you need it. Resistance to ciprofloxacin (the older first-line drug) is widespread in the region.

What is the best mosquito repellent for Sri Lanka?

DEET 20 to 30 percent, picaridin 20 percent, or oil of lemon eucalyptus (OLE) 30 percent. Apply over sunscreen, reapply per product instructions, and consider permethrin-treated clothing for safari and rural travel. Mosquito-borne dengue bites during the day, so daytime repellent matters.

Is Sri Lanka safe for solo travelers and families?

Yes for both, with appropriate planning. Solo travelers should book reputable accommodations and trusted drivers. Families with kids should strongly consider rabies pre-exposure vaccination because kids are more likely to interact with animals and less likely to report a minor scratch.

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Sources

• Centers for Disease Control and Prevention (CDC), Yellow Book and Sri Lanka destination page: https://wwwnc.cdc.gov/travel/destinations/traveler/none/sri-lanka
• World Health Organization, Sri Lanka malaria-free certification (2016): https://www.who.int/news/item/05-09-2016-who-certifies-sri-lanka-malaria-free
• World Health Organization, Dengue and severe dengue fact sheet: https://www.who.int/news-room/fact-sheets/detail/dengue-and-severe-dengue
• CDC, Rabies (international travel): https://wwwnc.cdc.gov/travel/diseases/rabies
• CDC, Hepatitis A vaccine recommendations: https://www.cdc.gov/hepatitis/hav/index.htm
• CDC, Typhoid fever and travelers: https://www.cdc.gov/typhoid-fever/index.html
• CDC, Japanese encephalitis vaccine guidance: https://www.cdc.gov/japanese-encephalitis/index.html
• Ministry of Health, Sri Lanka, National Dengue Control Unit: http://www.dengue.health.gov.lk/
• US State Department, Sri Lanka country information: https://travel.state.gov/content/travel/en/international-travel/International-Travel-Country-Information-Pages/SriLanka.html