Tropical paradise vs Tropical parasites?
Bali is a dream destination for millions each year, but it’s also home to two of the most common travel health woes: Bali Belly and Dengue Fever. These illnesses may sound harmless, but they can derail your holiday plans fast. The good news? Both are highly preventable.
Whether you’re heading for a spiritual retreat in Ubud or surfing in Canggu, here’s your go-to guide before you board your flight to stay healthy in the Island of the Gods.
Bali Belly
So what is "Bali Belly", really?
“Bali Belly” is a casual nickname for traveler’s diarrhea—caused by consuming unfamiliar bacteria or viruses from contaminated food, drinks, or surfaces. It’s extremely common among foreign visitors and typically lasts 1–3 days.
Most cases aren’t dangerous, but they can ruin your itinerary.
Symptoms may include:
- Stomach cramps
- Frequent loose stools
- Nausea or vomiting
- Bloating and fatigue
The most frequent etiology (cause) of Bali Belly is enterotoxigenic Escherichia coli (ETEC) — a type of E. coli bacteria that produces toxins leading to diarrhea. It’s commonly found in contaminated food or drinking water, especially in tropical and developing regions.
Other common pathogens include:
- Salmonella spp.
- Shigella spp.
- Campylobacter jejuni
- Viruses (like norovirus or rotavirus)
- Protozoa (like Giardia lamblia) — less common, but longer-lasting
But ETEC is the most typical culprit in short-term traveler’s diarrhea, especially for tourists visiting Southeast Asia like Bali.
Tips to Prevent Bali Belly
- Eat hot & fresh: Stick to food that’s freshly cooked and served hot.
- Be cautious with salads & ice: Avoid raw vegetables and street-side ice unless you’re sure of the hygiene.
- Drink sealed bottled water: Or use boiled water for brushing teeth.
- Wash your hands: Carry hand sanitizer and use it frequently—especially before eating.
- Stay on top of your vaccination: If you are not up-to-date on your adult vaccinations, you might want to consider getting yours upon arrival. Food-borne disease vaccinations you might want to consider include Typhoid Fever and Hepatitis A.
Dengue Fever
What is Dengue Fever?
Dengue is a mosquito-borne viral disease transmitted by Aedes aegypti, a mosquito that bites mostly during the day. It’s a growing concern across Southeast Asia, and Indonesia sees thousands of cases annually—especially during rainy season (November–April).
Symptoms can include:
- Sudden high fever
- Severe joint/muscle pain (nicknamed “breakbone fever”)
- Skin rash
- Headache and pain behind the eyes
There’s no specific cure for dengue, and in some cases, it can lead to hospitalization.
Tips to Prevent Dengue Fever
- Use mosquito repellent: Choose one that contains DEET or picaridin.
- Cover up: Wear long-sleeved clothing and pants, especially in early morning and evening.
- Sleep smart: Stay in air-conditioned rooms or use mosquito nets in open accommodations..
- Eliminate breeding sites: Empty out containers or buckets with standing water.
- Stay on top of your vaccination: If you are not up-to-date on your adult vaccinations, you might want to consider getting your Dengue Fever vaccination upon arrival.
Vaccination
Do I really need to get vaccinated?
While there’s no vaccine for Bali Belly, you can prepare your immune system by making sure that you’re up-to-date on the available food-borne illness vaccinations, taking probiotics and cautious eating.
Dengue vaccination is now available in select countries, including Indonesia—for travelers who plan extended stays or return visits.
So, do you really need to get vaccinated? No, there’s always the option of braving the elements and having a “come what may” attitude. Bali does have plenty of international-standard, top-of-the-line hospitals as well, if that’s the direction of adventure you plan on taking for your visit.
However, if you prefer a better outlook for your use of time spent in Bali, e.g for vacation, business trips, etc, getting shielded from these tropical bugs might benefit you. Below are several of the vaccinations we recommend:
Typhoid Vaccine
1. What is the typhoid vaccine?
A vaccine that protects against Salmonella typhi, a bacteria that causes typhoid fever—spread through contaminated food and water.
2. How does it work?
It stimulates your immune system to recognize and fight Salmonella typhi if you’re exposed.
3. Can I have the typhoid vaccine?
Yes, Typhoid Fever vaccination is recommended for most travelers to Indonesia. We offer the injectable Typhoid Polysaccharide Vaccine that is eligible for anyone from as young as 2 (two) years old.
4. How many vaccines do I need?
The Typhoid Polysaccharide Vaccine is given as a single dose and has quite a long duration of protection, which makes it suitable for various reasons and lengths of stay.
For last minute travellers, it is never too late to have the vaccine upon arrival.
5. Will I need a booster?
The Typhoid Polysaccharide Vaccine provides quite a long protection, but wanes over time. If you’re planning to stay for more than 2 (two) years or you’ve decided to call Bali your home, we recommend getting the vaccine every 2 (two) to 3 (three) years.
Dengue Vaccine
1. What is the dengue vaccine?
Qdenga is a dengue vaccine designed to reduce the severity and frequency of all four dengue virus serotypes, caused by mosquito bites (Aedes aegypti). Unlike its predecessor, Dengvaxia, the Qdenga vaccine can be used in individuals over 6 (six) years of age regardless of previous dengue exposure and without the need for pre-vaccination testing.
2. How does it work?
QDENGA® (TAK-003) is a dengue vaccine that is based on a live-attenuated dengue serotype 2 virus, which provides the genetic “backbone” for all four dengue virus serotypes (DENV1, DENV2, DENV3, and DENV4) and is designed to protect against any of these serotypes.
The vaccine works by stimulating the body’s immune system to produce antibodies against these viruses, without causing the actual disease. This immune response helps to prevent dengue infection and hospitalization when the individual is later exposed to the virus.
3. Can I have the dengue vaccine?
Yes, the Qdenga Dengue Fever vaccination is recommended for most travelers to Indonesia above 6 years of age, regardless of previous exposure and without the need for pre-vaccination testing (a mandatory course of action for its predecessor, Dengvaxia).
4. How many vaccines do I need?
The dengue vaccine Qdenga is given in two doses, spaced three months apart.
We understand not every traveler has the luxury of planning months in advance—but here’s the good news: even a single dose of Qdenga already offers around 81% protection against all four dengue virus types, which lasts until the second dose is received.
So even if your trip is just around the corner, it’s not too late to get vaccinated.
Completing the second dose increases your protection significantly—up to 95%, lasting from one month to a full year after the final dose.
5. Will I need a booster?
Through four and a half years (54 months after the second dose), Qdenga demonstrated continued overall protection, with sustained overall VE (Vaccine Efficacy) of 61.2% and 84.1% VE against hospitalized dengue. There are no official recommendations on the need for booster dose, as studies are still ongoing.
Hepatitis A Vaccine
1. What is the Hepatitis A vaccine?
The hepatitis A vaccine is designed to protect you from the hepatitis A virus, a highly contagious liver infection. It’s typically spread through consumption of contaminated food or water, especially in places with lower sanitation standards. Shellfish, raw fruits and vegetables, or food prepared without proper hygiene are common culprits.
Travelers to Indonesia, and most tropical countries, are considered at risk, making this vaccine an essential part of your travel preparation.
2. How does it work?
The hepatitis A vaccine are available in 2 (two) modals; the monovalent vaccine (protects only against hepatitis A), and the combination vaccine (protects against hepatitis A and hepatitis B).
The vaccine works by introducing a harmless form of the hepatitis A (and or in combination with hepatitis B) virus to your immune system. This triggers your body to produce antibodies, which serve as a long-term defense if you’re ever exposed to the real virus. Think of it as training your body to recognize and neutralize the threat before it becomes a problem.
It doesn’t contain live virus, so it cannot cause hepatitis A, and is considered very safe.
3. Can I have the hepatitis A vaccine?
Yes—most travelers can and should get it. The vaccine is recommended for all travelers visiting Indonesia, regardless of how short the stay, especially if you plan to eat local food, stay in rural areas, or have underlying medical conditions.
The monovalent vaccine (e.g. Avaxim) is approved and available in different formulations for adults and children aged 12 months and older. The combination vaccine (Twinrix) is only recommended for individuals over 18 years of age.
Even if you’ve already had hepatitis A in the past, your doctor can help confirm whether vaccination is still necessary.
4. How many vaccines do I need?
- Avaxim
Adults are given the vaccine in a 2-dose series at 0 and 6 to 12 month.
The first dose already provides strong protection within 2–4 weeks, which is sufficient for short-term travel.
However, the second dose is essential for building long-term immunity, so it’s important to schedule a follow-up after your trip if time is short before departure.
- Twinrix (Hepatitis A & Hepatitis B Combo Vaccine)
– Regular Schedule: Adults may be given the combination HepA and HepB vaccine on a 3-dose schedule: at 0, 1, and 6 months. The first and second doses should be separated by ≥ 4 weeks, and the second and third doses should be separated by ≥ 5 months.
– Accelerated Schedule: Alternatively, the vaccine may be given on an accelerated 4-dose schedule: on days 0, 7, and 21 to 30, followed by a booster 12 months after the first dose.
5. Will I need a booster?
In most cases, no booster is needed. Once you’ve received both doses, protection typically lasts at least 20 years—and potentially for life. If you’re unsure about your vaccination history, our team at Vaxcorp can help you check your records or run a quick antibody test.
Preparedness & Mitigation
What to Pack in Your Health Kit
Make your Bali trip worry-free by packing a compact travel health kit:
- Oral Rehydration Salts (ORS)
- Antidiarrheal meds (e.g., loperamide)
- Mosquito repellent (30% DEET or more)
- Electrolyte tablets
- Light, breathable clothing
- Mosquito net or bug spray for your room
- Digital thermometer
- Probiotics (start before you fly)
- Basic antibiotics (with doctor’s prescription)
Need a personalized recommendation? Our doctors at Vaxcorp are ready to help.
What to Do If You Get Sick in Bali
Most mild symptoms can be treated with rest, fluids, and meds from a nearby pharmacy. But if symptoms persist or worsen, seek medical help.
When to see a doctor:
Persistent high fever (>38.5°C)
Blood in stool or severe dehydration
Rash + joint pain (possible dengue)
Vomiting that lasts more than 24 hours
Major tourist areas like Seminyak, Ubud, and Nusa Dua have English-speaking doctors and clinics available.
➡️ Prefer to be proactive? Book a Travel Health Check with Vaxcorp Indonesia before your flight.
Final Tips for a Healthy Bali Trip
Don’t skip meals, but don’t overdo local spicy dishes on Day 1 either.
Stay hydrated—but only with clean water.
Always pack travel insurance—it’s a small cost for big peace of mind.
Choose accommodations with good hygiene reviews.
Being informed is the first step to staying safe. You don’t need to be paranoid—just prepared.
