Bali belly after returning home: why it lingers, and what to do

Why the timing fools everyone

Australians go to Bali for a week or ten days. The common bacterial causes of traveller's diarrhoea produce symptoms within a day or two of exposure, run their course in a few days, and are usually over before the return flight. That is the version everyone expects.

The slow one behaves completely differently, and the published incubation window is the reason it goes unrecognised:

Symptoms of giardiasis start 3 to 25 days after infection with the parasite.

Twenty five days is more than three weeks. By the time symptoms begin, you have been back at work for a fortnight, you have eaten a hundred meals in Australia, and Bali is not remotely in your mind as the cause. So you describe your symptoms to a GP without the one piece of context that would change the workup.

The other way this presents is a case that never fully ended. It eased on the plane, you assumed you had recovered, and it has been grumbling along ever since. healthdirect's note that giardiasis symptoms may last for months, especially if left untreated, covers that pattern exactly.

What to tell your GP

Go in with the facts already assembled. It takes two minutes to write down and it is the difference between a useful appointment and a vague one.

• Where you went and the exact dates. Country and region, departure and return.
• When symptoms started, relative to those dates, and whether they have ever fully stopped.
• What the symptoms are: stool frequency and consistency, bloating and wind, cramping, nausea, fever, and any weight lost.
• Anything you took, including antibiotics bought over the counter overseas, anti-diarrhoeal tablets, and any supplements.
• Whether anyone you travelled with is also unwell, which is useful information.
• Anything relevant about you: pregnancy, medications, immune conditions, or a gut condition you already manage.

Ask specifically about stool testing. healthdirect describes diagnosis of giardiasis as sending a sample of your stool to the lab. More than one sample is sometimes needed, because the parasite is shed intermittently and a single negative does not always settle it.

What is normal recovery, and what is not

Blood or mucus in the stool, a fever, or diarrhoea that wakes you at night are all reasons to be seen, at home just as much as in a Bali clinic.

Not giving it to the household

If you are still unwell, you are potentially still infectious, and home is where the people you most want to protect live. The Australian rule for gastroenteritis is the same one that applies in a Bali villa:

Children and adults should not return to school or work until 48 hours after the last episode of diarrhoea and or vomiting.

For giardiasis the exclusion is until there has been no diarrhoea for at least 24 hours. Alongside that: soap and water rather than hand sanitiser, particularly if norovirus is a possibility, because healthdirect states plainly that alcohol-based sanitisers do not work on it. Do not prepare food for the household while you are symptomatic, and wash towels and bedding hot.

There is a work dimension too. If you handle food, work in healthcare, or work in childcare or aged care, the exclusion periods are not advisory and your employer will have a policy. Tell them rather than pushing through.

The practical bits nobody mentions

Medicare covers you again the moment you are home, so a GP visit and pathology are the ordinary Australian arrangement rather than a travel insurance claim. If you saw a doctor or a clinic while you were away and paid up front, that receipt is the insurance claim, and most policies have a deadline for lodging it. Dig it out of your bag now rather than in three months.

Keep the dates. If a test comes back positive for something notifiable, your GP handles the reporting and may ask about exactly where you ate and swam. Written dates beat a vague memory of the second Tuesday.

Do not self-medicate with leftovers. Antibiotics bought over the counter overseas, or left from an old prescription, can make a stool result harder to interpret and are a poor idea regardless.

Before the next trip

If it was a rough one, the useful response is not a product, it is a habit. The food and water routine on how to avoid Bali belly is where the difference actually gets made, and the water page covers the details people get wrong: ice, toothbrushes, showers and formula.

It is also worth a GP visit well before you fly next time, ideally around eight weeks out. That conversation covers vaccinations, anything you take regularly, and what to pack. What vaccinations you need for Bali and the Bali medical kit are the two pages to read before that appointment so you arrive with questions rather than a blank.