Cyclospora is an infection of the bowel caused by a tiny parasite called Cyclospora cayetanensis. It is usually caught from eating raw fruit and vegetables contaminated with human faeces (poo). 

Diarrhoea, which can often be severe, is the most common symptom of cyclospora. Symptoms usually appear about a week after catching the parasite.

Other symptoms can include:

Less common symptoms include vomiting, body aches, headache, fever and other flu-like symptoms.

Although these symptoms are often unpleasant, cyclospora doesn't usually pose a serious threat to health and can be easily treated using antibiotics.

Some people with cyclospora don't have any symptoms. These are usually people who've grown up in a developing country and been previously exposed to the parasite.

Who's at risk?

People travelling to tropical or subtropical countries may be at increased risk of infection because cyclospora is common in many developing countries.

Most of the cases reported in England and Wales involve people who'vereturned from trips to:

  • the Caribbean
  • Central and South America
  • Turkey
  • the Indian subcontinent
  • the Far East

There have been relatively few cases involving people holidaying in Africa.

What causes cyclospora?

Cyclospora is caught by consuming food – especially raw berries, herbs and salad items – or water contaminated with human faeces (poo) carrying theparasite.

The parasite lives in the poo. You can't catch cyclospora by coming into contact with an infected person, such as someone who hasn’t washed their handsafter going to the toilet. Once in the poo, the parasite takes about 10days before becoming infectious.

Treating cyclospora

If cyclospora isn't treated, the illness may last from a few days to a monthor longer. Symptoms may seem to go away and then return more than once. It'scommon to feel very tired.

If you think you have cyclospora, you're advised to see your GP to check your symptoms. Mention your recent travel history.

Cyclospora is treated with a course of antibiotics called co-trimoxazole.

Preventing cyclospora

The following hygiene measures will help reduce your risk of catchingcyclospora when travelling to affected areas:

  • wash your hands (with soap and water) after going to the toilet
  • wash hands before preparing or eating food
  • make sure food is steaming hot
  • avoid raw fruit and vegetables that haven't been washed in clean water
  • only drink bottled water and avoid ice in drinks
  • beware of any product that you suspect may have been tampered with, including bottled water


For more general advice about avoiding food poisoningwhile on holiday, read food and waterabroad

Page last reviewed: 11/08/2015

Next review due: 11/08/2017