Dengue fever in Bali: symptoms, testing and warning signs

What does dengue feel like when it starts?

Symptoms begin 4 to 10 days after the bite and arrive suddenly rather than building over a week. Locally the illness is called demam berdarah, or DBD on a lab form, and you will hear both from staff long before anyone says dengue in English.

• Fever that climbs fast, often 39 to 40°C, sometimes with teeth-chattering chills
• A headache that sits behind the eyes and gets worse when you move them
• Deep muscle, bone and joint pain. The old name, breakbone fever, was not poetic licence
• Nausea, no appetite, and a flattened tiredness that startles otherwise fit people
• A flushed face and neck early on, then a blotchy red rash from around day three to five
• Tiny red pinprick spots on the skin, bruises you cannot account for, or gums that bleed when you brush

The first blood count often gives the game away before any antibody test does. Platelets slide (thrombocytopenia) and the white cell count drops (leukopenia). That combination is unusual in the bacterial infections dengue gets confused with, where white cells normally climb instead. A doctor reading a low platelet count and a low white count on day three in Bali is already thinking dengue.

There are four types of the virus, DENV-1 to DENV-4, all four circulate in Indonesia, and catching one does not protect you from the others. A second infection with a different type carries a higher risk of the severe form, which is why it is worth telling any doctor here if you have had dengue before, even years ago on another continent.

Why day five can be worse than day two

Dengue is one of the few illnesses where the day you are on changes what you should do. It moves through three phases, and the middle one is the one to respect.

The middle row deserves an explanation, because almost nothing online gives one. During the critical phase the immune response makes the smallest blood vessels temporarily leaky, and watery fluid seeps out of the circulation into the belly and the space around the lungs. Doctors call it plasma leakage. The blood left behind gets more concentrated, so the haematocrit rises, while platelets fall at the same time. Severe dengue is what happens when enough fluid leaks out that the circulation starts to fail. Indonesian lab reports and older doctors still use the terms dengue haemorrhagic fever and dengue shock syndrome for that end of the spectrum; current guidance simply calls it severe dengue.

That one mechanism explains most of what follows: why the fever breaking is no reassurance, why the trend across repeated blood counts matters far more than any single result, and why steady sipping helps while too much fluid into a vein can drown someone once the leak closes and everything floods back at once. If a person feels dramatically worse as they cool down, that is the moment to act.

Is it dengue, or something that looks like it?

In the first 48 hours a lot of things in Bali look identical: fever, headache, aching, feeling wretched. Some of the alternatives are treatable with antibiotics, which is why guessing is expensive.

Expect a doctor to ask the exact day your fever started, where you have been in the past two weeks, whether you swam in fresh water or walked through flooding, and whether anyone else in the villa is ill. Those four answers narrow things down faster than the symptom list does. Malaria, for the record, is not a meaningful risk in Bali. It still is in Papua, and in parts of Nusa Tenggara and Maluku, which matters if you are island-hopping east.

Where can I get a dengue test in Bali, and what does it cost?

Getting blood drawn is the practical question, and in Bali it happens in one of three places.

• Sample collected where you are staying. A nurse comes to the hotel or villa, the draw takes about ten minutes, and results usually come back the same day by phone or email. This is the sensible option when standing up is an achievement, and it is what most of our dengue patients use.
• A private lab or hospital lab. The big chains and hospital labs (Prodia, Siloam, BIMC and similar) have branches around Denpasar, Kuta, Seminyak, Canggu and Ubud. Walk in, no appointment needed for a basic panel, and expect a wait.
• The Puskesmas, the government community health centre in every district, is the cheapest option and perfectly competent at a blood count. Consultations run in Bahasa Indonesia, and a confirmed case gets reported to the district health office, which is why a fogging truck sometimes appears in the neighbourhood a day or two later.

Which test depends entirely on how many days you have had a fever, which is why a doctor asks about timing before ordering anything:

• NS1 antigen. Detects a viral protein, most useful from the first day of fever to about day five. A rapid NS1 usually comes back within a couple of hours.
• IgM and IgG antibodies. These measure your immune response, which takes time to appear. IgM generally becomes detectable from about day four or five. IgG shows up later in a first infection and rises early in a repeat one, which is one way a lab spots a second infection.
• Full blood count. The most important test on the list, and the one that gets repeated. Falling platelets and a rising haematocrit are the objective signs that the critical phase is underway.
• PCR finds the virus itself in the first few days. It is more specialised, slower to report in Bali, and often unnecessary once NS1 and a blood count give a clear picture.

Your lab sheet will be in Indonesian, so a little vocabulary helps: trombosit is platelets, hematokrit is haematocrit, leukosit is white cells, and Hb is haemoglobin. Ask for the actual numbers rather than a positive or negative, and photograph every result. Through days 3 to 7 the count is usually repeated daily, sometimes twice daily, and whoever is looking after you needs to see the line, not the dot.

On price: testing is one of the cheaper things you will pay for in Bali. An NS1 with a full blood count at a private lab costs roughly what a good dinner for two costs in Seminyak, hospital labs charge more, and the repeat counts across a week are what add up. We confirm the exact figure before anything is booked, and give you an itemised receipt in a form insurers accept. A negative test on day one or two does not rule dengue out, particularly in a second infection, so retesting is routine rather than a sign that something went wrong.

How is dengue treated?

No antiviral cures dengue, and nothing shortens it. Treatment is supportive, and done properly it works.

• Fluids, steadily. Water plus oral rehydration salts, sold as oralit in every apotek and minimarket, sipped through the day rather than gulped twice. Passing pale urine every few hours is the simplest home marker that you are keeping up. Coconut water counts. Beer does not.
• Paracetamol for fever and pain, following the packet, which in Bali is often printed in Bahasa Indonesia. For most adults that means no more than 1 gram at a time and no more than 4 grams in 24 hours, and less if you are small, drink heavily or have any liver problem. Doctors often keep the daily total below that in dengue, so ask. Combination cold and flu sachets usually contain paracetamol too, which is how people double up without noticing.
• No ibuprofen, aspirin or other anti-inflammatory painkillers. They increase the risk of bleeding and stomach irritation when platelets are already falling, and aspirin should never be given to a child.
• Say no to injections into the muscle. The WHO advises against them in dengue, and the reason is simple: while platelets are low, a needle into muscle can bleed into it and leave a deep, painful bruise. Small clinics here still offer injectable fever shots and vitamin jabs. Relief by mouth is safer, and anything into a vein should follow an assessment.
• Rest properly and skip alcohol. Surfing, scooters and the gym wait until you have recovered, because bruising and bleeding come easily while platelets are low.
• Keep using repellent while you are ill. A mosquito that bites you can pass dengue to the people you are travelling with, and household clusters are how it usually spreads.
• Do not spend days 3 to 7 alone if you can avoid it. Someone who can look at you and notice you have gone quiet, cold or confused is worth more than any test.

Antibiotics do nothing for dengue, because it is a virus. They matter only when a doctor suspects a bacterial infection instead of it or alongside it, which is a judgement made after a doctor's assessment, not a guess made at a pharmacy counter. An IV drip is not a wellness purchase here either. Fluid into a vein can be exactly right, or dangerous during the critical phase, because once the leak closes the fluid returns to the circulation all at once. Drips belong after a clinical assessment, not on a menu next to a vitamin blend.

Do papaya leaf and other platelet boosters work?

Say the word dengue in Bali and offers arrive within the hour: papaya leaf extract (daun pepaya), guava juice, angkak, which is red yeast rice, platelet-booster packages and vitamin drips. Nobody offering them is trying to hurt you. Several are family tradition, and the intention is kind.

What the evidence shows is thinner than the enthusiasm. A handful of small trials suggest papaya leaf extract may lift a platelet count somewhat faster, but no study has shown it changes what actually matters: whether someone leaks plasma, ends up in an intensive care bed, or dies. Angkak has less behind it again, and red yeast rice contains a compound that behaves like a cholesterol medicine, so it can interact with other things you take. Guava juice is fluid with some vitamin C in it, which is fine, and no more than that.

The trouble is what the reassurance does. Someone drinking papaya leaf three times a day feels they are treating the illness, and a person who feels treated is slower to repeat a blood count or to notice that the stomach pain starting on day five is not indigestion. Take the herbs if you want to, tell your doctor what you are taking so nothing interacts, and keep the blood counts going anyway.

Warning signs: when dengue becomes an emergency

Most dengue stays mild. A minority becomes severe dengue, usually inside that day 3 to 7 window, and it can move within hours. The list below is the World Health Organization's warning-sign list, the same one Indonesian hospitals work from. Any of these means a hospital emergency department immediately, at any hour:

• Severe or worsening stomach pain, or tenderness when you press the belly
• Persistent vomiting, or being unable to keep fluids down
• Bleeding: gums, nose, blood in vomit or stool, black tarry stools, or unusually heavy vaginal bleeding
• Drowsiness, confusion, agitation or restlessness
• Cold, clammy or mottled skin, pallor, or feeling faint on standing
• Difficulty breathing, or a belly that is visibly swelling
• Passing little or no urine for six to eight hours
• Feeling dramatically worse as the fever drops

In a child, act sooner. No wet nappy or no urine for about six hours, refusing to drink, unusual sleepiness or irritability, cold hands and feet, or vomiting that will not stop all mean the same thing: hospital now. Children deteriorate faster than adults and they compensate well right up until they do not.

Some people are usually safer managed in hospital than at a villa, warning signs or not: pregnant women, babies and young children, older travellers, anyone with diabetes, obesity, or heart, kidney or liver disease, and anyone taking blood thinners. The same applies if you are staying alone, or a long drive from the nearest emergency department. If you have had dengue before, say so, because a second infection with a different serotype raises the bar for how closely you should be watched.

What happens if you are admitted to hospital in Bali with dengue?

Work out the answer to one question on day one, while you are still well enough to use a phone: how far is the nearest emergency department, and how do you get there at 2am? Private hospitals with emergency departments and English-speaking staff cluster around Denpasar, Kuta, Seminyak, Nusa Dua and Ubud. From Amed, Sidemen, Munduk or Pemuteran you are looking at one to three hours of dark mountain road. From Nusa Penida you are looking at a boat that does not run all night. Save the hospital address in Indonesian in your phone so a driver can read it without translating anything.

Take a passport, your insurance policy number and the insurer's 24-hour line, photographs of every lab result so far, and a list of everything you have taken, herbs included.

Admission itself is undramatic and mostly involves waiting. A cannula goes in, fluids run, and blood counts are repeated every 6 to 12 hours, more often if the numbers are moving. Beyond paracetamol there is not much medicine involved: the treatment is fluid balance and observation, adjusted to the counts. Most people who are admitted stay two to four nights and go home once platelets are climbing again, the leak has closed, and they can eat and drink normally.

Payment catches travellers out more often than the medicine does. Some insurers will issue a guarantee of payment directly to the hospital if you call them at admission, which means the hospital bills them instead of you. Many travellers meet the other reality and pay first, then claim back. Either way, keep every receipt, ask for an itemised bill and a discharge summary in English, and get a medical report if you need to change flights or support a claim.

What can a doctor do without being in the room?

Some of this works over a screen. Some of it does not.

• Works remotely: a video assessment of your symptoms and timeline, choosing the right test for the day you are on, a blood draw at your hotel or villa, results explained properly, safe advice on what to take and what to avoid, daily check-ins through the critical window, and the paperwork for an insurance claim or a change of flights.
• Needs hands on you: if you cannot keep fluids down, or you need examining rather than describing, a doctor or nurse can be coordinated to your hotel or villa, usually the same day.
• Needs a hospital: severe dengue, shock, significant bleeding, or a blood count heading the wrong way. No telemedicine replaces that. The point of monitoring is to catch the turn early enough to move you in time.

Bali Doc does not prescribe or dispense medication itself. Licensed doctors assess you and prescribe at their own discretion, and licensed, BPOM-registered partner pharmacies dispense and deliver. A doctor's assessment is required before any prescription. Some medication, including controlled substances, requires a specialist consultation and may be restricted under Indonesian law. Outcomes vary, and no consultation can promise a mild illness. What it can do is make sure nothing is missed while your body does the work.

After dengue: how long does recovery take, and can you fly home?

Recovery is slower than the fever chart suggests. The temperature settles around day seven and people expect to be back on a surfboard by day nine, then find that a walk to the warung is enough for one day. Profound fatigue for two to six weeks is normal, and it comes in waves rather than a straight line. An itchy rash on the palms and soles often turns up as you improve, sometimes peeling, and it is a recovery sign rather than a relapse. A month or two later some people notice their hair shedding in the shower, which is the classic stress-shedding pattern described in our guide to hair loss and why it happens after illness. It settles on its own.

Alcohol, hard exercise and anything that risks a knock can wait until you feel steady and, if there was a low platelet count, until it has recovered. Most blood services at home will also defer you from donating for a period after dengue; the length varies by country, so check your national service before you book a donation.

On flying, timing decides it. Flying during the critical phase, or while platelets are still falling, puts a dozen hours between you and a hospital at exactly the wrong moment, and cabin crew are not in a position to help. Once you are eating and drinking, the fever has gone and your counts are climbing again, a normal flight home is usually fine, though expect the long leg to flatten you for a few days after landing. If you need to move a booking or satisfy an insurer, a doctor can do a fit-to-fly assessment and issue the letter the airline and insurer will ask for, with the dates and diagnosis they need.

How do you avoid dengue in Bali?

There is no substitute for not being bitten. Aedes aegypti, and its cousin Aedes albopictus, bite in daylight, which is why evening-only precautions miss most of the risk.

• Use a repellent containing DEET or picaridin on exposed skin, reapplied as the label says, and especially after swimming or sweating.
• Cover up in the early morning and late afternoon, when biting peaks.
• Sleep with screens, air conditioning or a net, and keep doors shut at dusk.
• Tip out standing water where you are staying: plant saucers, buckets, pool covers, water features and blocked drains. These mosquitoes breed in clean, still water and need surprisingly little of it.
• If someone in your group has dengue, protect them from being bitten too. That is what stops the chain reaching everyone else in the villa.

A two-dose dengue vaccine is licensed in a number of countries, Indonesia among them, and in some places it is offered to travellers. The doses sit three months apart, so it is a decision to make with a travel-medicine clinic months before a trip, not something to arrange on arrival. Eligibility depends on your age and, in some countries, on whether you have had dengue before, and no vaccine removes the need to avoid bites. It is worth raising at the same appointment where you sort out what you are allowed to bring into Indonesia, because the medication rules catch far more travellers out than the vaccine question does. If you are still planning and want to run through it with a doctor, message us before you fly.

What to remember

How dengue goes is decided mostly by the calendar and by the company you keep. Know which day of fever you are on, because it dictates which test is worth doing and when to worry. Do not spend days 3 to 7 by yourself if you can help it. And if the fever drops and you feel worse instead of better, that is a hospital, tonight.

General information, not medical advice. Severe dengue is a medical emergency: seek in-person care or call local emergency services (118 or 112). A licensed doctor should assess your symptoms before any treatment.