Travellers' diarrhoea

Travellers’ diarrhoea is a fact of life when travelling, no matter how careful you are with food and drink. Between 30% and 70% of travellers experience it, with the risk depending on where and when you travel. However, this is a lot you can do to reduce your chances of getting it and managing the symptoms if you do.

Which areas are the riskiest?

  • High-risk regions for an attack of travellers’ diarrhoea include the majority of Asia, the Middle East, Africa, Mexico, Central and South America.
  • Moderate-risk regions include Eastern Europe, South Africa, parts of Asia and some Caribbean islands.
  • Low-risk regions include Northern and Western Europe, North America, Australia, New Zealand and Japan.

Who is most at risk?

It seems that you’re more at risk of traveller’s diarrhoea if you are a younger rather than an older traveller. This might be because younger travellers tend to be more adventurous and are more likely to take risks than their older counterparts.

You are also at risk if you have type 1 diabetes, heart failure, advanced cancer, HIV infection or inflammatory bowel disease.

Causes of travellers’ diarrhoea

The most common cause of travellers’ diarrhoea is ingesting food or water contaminated by diarrhoea-causing microorganisms, usually because of poor restaurant hygiene or sanitation. (As local people are repeatedly exposed to these microorganisms, they become immune and so aren’t affected.)

  • Bacteria such as E. Coli and Salmonella cause 50¬–80% of attacks.
  • Other microorganisms that can cause diarrhoea include viruses such as rotavirus, and protozoal parasites like Giardia lamblia (also known as Giardia intestinalis or Giardia duodenalis).

Because there are so many different microorganisms that can cause travellers’ diarrhoea, experiencing one bout of illness does not exclude you from experiencing another. This means you shouldn’t let down your guard once you’ve had an attack and should remain vigilant about what you eat and drink.


You may experience nothing more than one or two attacks of diarrhoea a day with no additional symptoms.

If your illness is more severe, you will experience frequent bouts of diarrhoea accompanied by any of the following symptoms:

  • nausea and/or vomiting
  • abdominal pain and cramps
  • fever
  • blood in your stools.

Symptoms usually last about 3–4 days and generally resolve of their own accord as your body builds immunity to the organism.

Self-treating travellers’ diarrhoea

Be prepared

There are things you can take with you to combat travellers’ diarrhoea, including antibiotics. It is always a good idea to obtain these before you go travelling to a risky area, just in case. They may not be available at your destination and even if they are, you may not be in a position to venture out and buy them once you become ill.

If you are travelling for more than 2 weeks to a destination where the parasite Giardia lamblia is prevalent, also consider obtaining a precautionary prescription for metronidazole or tinidazole from your doctor. You should only take this medication in the event of travellers’ diarrhoea that persists despite taking other antibiotics.

Treating mild illness

For a mild attack of diarrhoea, drink plenty of water from a safe source to avoid dehydration. You can also take oral rehydration drinks such as Gastrolyte or Hydralyte that can help replace lost salt from your body.

Anti-diarrhoeal medicine, such as Imodium or Gastro-Stop (loperamide) or Lomotil (diphenoxylate + atropine sulfate) are medications you can take that help stop the diarrhoea. These medicines can decrease the number of diarrhoeal stools; however, as they work by slowing down the passage of the gut's contents, they can cause complications for people with serious infections by delaying the expulsion of the infectious agent via the diarrhoea. They should never be used if a person has a fever or bloody diarrhoea, They should never be used in children.

More severe illness

If your symptoms worsen or don’t improve after 24 hours, or your symptoms are more severe in the first place, you can also take a course of antibiotics such as norfloxacin or azithromycin, as prescribed by your doctor. These may help shorten the duration of your illness. Take these in conjunction with the anti-diarrhoeal agent.

Avoid taking anti-diarrhoeal medications like loperamide (e.g. Imodium, Gastro-Stop) if you develop a fever or bloody diarrhoea though. Having diarrhoea is your body’s natural response to help rid it of the infection. By stopping the diarrhoea, you are preventing this, which may prolong your illness.

When to see a doctor

You should seek medical help if:

  • your diarrhoea persists for more than 2 weeks, or antibiotics have failed to have an effect. (You may have become infected with a parasite and need further treatment)
  • your stools are bloody or very frequent and watery
  • your diarrhoea is accompanied by repeated vomiting, fever or chills
  • you can’t drink enough fluid to stay hydrated.


The best way to prevent diarrhoea is by paying meticulous attention to your choice of food and drink, and by being careful about personal hygiene.

  • Always wash your hands with soap and water – after going to the toilet and before eating, making sure they are completely dry before you touch food. You can also carry alcohol-based hand sanitisers around with you to wash your hands.
  • Watch what you eat – in areas where hygiene and sanitation are poor the simple rule of: ‘Boil it, cook it, peel it, or forget it’, is a good place to start.
    • Avoid: high-risk foods like undercooked meat, fish, shellfish; unpasteurised milk and milk-based products (yoghurt, cheese and ice cream); and raw foods like salads and uncooked vegetables. Eat only food that is fully cooked and served hot.
    • Stick to fruits you can peel yourself. It’s best to avoid fruits you can’t peel, like strawberries or blueberries. If you do eat them, make sure you can wash them in clean, safe water first, and dry them thoroughly before eating.
    • Don’t risk eating food that has been kept at room temperature for long periods, even if it is in a nice hotel or restaurant.
  • Don’t drink unsafe water – boil it (most effective method), purify it (with pharmacy-bought iodine or chlorine tablets/solutions), or use a reliable filter before you drink it. Alternatively, stick to bottled water. This applies to water for cleaning your teeth and for making ice cubes too.
  • Watch what else you drink – hot tea and coffee, canned or bottled soft drinks, beers and wines are generally safe to drink, as is boiled milk or milk from pasteurised sources. Raw or unpasteurised fruit juices or iced tea or coffee on the other hand, are best avoided.
  • Do your best not to ingest water during water activities and don’t enter water you have doubts about – this includes hot tubs and spas. Not only does this reduce your chances of getting diarrhoea from contaminated water, but it also reduces your risk of getting other illnesses that result from waterborne microorganisms, such as Legionella.

Travellers’ diarrhoea in children

The most important thing you can do if your child develops travellers’ diarrhoea is keep them hydrated. Give them water from a safe source or diluted lemonade, fruit juice or cordial. Children with diarrhoea who show signs of mild dehydration, such as thirst and restlessness, can also be given oral rehydration drinks.

It is best not to give your children anti-diarrhoeal medications without the say-so of a doctor, due to the risk of side effects.

When a child with diarrhoea should see a doctor

You should seek medical help if your child has any of the following symptoms:

  • bloody diarrhoea
  • dehydration that is moderate or severe
  • a fever in excess of 38.6°C
  • persistent vomiting.

Seek medical advice if your baby develops diarrhoea while travelling too. Breastfed babies can also be given oral rehydration drinks, and should be allowed to nurse on demand.


The same preventative measures apply to children as well as adults. In addition, for babies and infants:

  • Disinfect all water used to prepare infant formula by boiling it, even if the water is bottled.
  • Pay scrupulous attention to your hand washing after changing nappies to prevent the spread of infection.
  • Be extra careful about cleaning baby bottles, dummies and any toys that fall on the floor or have been handled by others.
  • Don’t allow your child to crawl around on the floors or put their fingers in their mouth.
  • Be sure to wash your young child’s hands frequently.


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