Cyclosporiasis is a foodborne infection primarily affecting the digestive system. It is caused by the consumption of the parasite Cyclospora cayetanensis. They are commonly spread through contaminated food or water. Although the infection is not typically life-threatening, it can last for weeks and, in the meantime, lead to the dangerous condition of dehydration.

The following information will help you recover from a possible infection and familiarize you with the symptoms, causes, treatments, and defenses.

What Is Cyclosporiasis?

Cyclosporiasis is a food and water-borne intestinal infection of the parasite Cyclospora cayetanensis. Once contaminated, food and water will usually lead to the infection within about a week. At that point, symptoms will usually consist of watery diarrhea with other digestive issues.

More than one thousand cases of Cyclosporiasis were newly registered in the United States in the year 2025. Due to the lack of resources and sanitation in certain geographic areas of the world, the infection is more routinely found in the tropical and subtropical regions. Those areas include parts of:

Central America
South America
Europe
Asia
Africa

With the proper treatment, the average healthy person will recover from this infection. It is more dangerous, however, for children, the elderly, and immunocompromised persons.

Symptoms and Causes

Symptoms of Cyclosporiasis

The most commonly and noticeably significant symptom of Cyclosporiasis is the frequent occurrence of watery diarrhea that can be quite severe. In addition to diarrhea, many people may experience a variety of digestive issues as well as some other general health symptoms.

Common symptoms of Cyclosporiasis include:

Watery or explosive diarrhea
Stomach cramps and abdominal pain
Loss of appetite
Nausea and vomiting
Bloating, excessive burping, or gas
Fatigue or weakness
Low-grade fever
Unintentional weight loss in prolonged cases
Some infected persons remain asymptomatic.

What Causes Cyclosporiasis?

Cyclosporiasis is an infection caused by the parasite Cyclospora cayetanensis, a microscopic fecal-oral parasite that is only visible by a microscope. This parasite survives by infecting humans and some primates.

How Is It Transmitted?

Cyclospora infection is most commonly due to:

Contaminated or fecally infected water
Ingestion of fresh fruits and vegetables washed or harbored with fecally infected water
Contaminated Recreational Water

Traditional gastrointestinal infection routes of person to person infection do not facilitate the spread of Cyclospora.

Risk Factors

Cyclosporiasis can infect anyone, but is more likely to occur in persons who:

Travel to tropical and subtropical regions
Reside in countries with poor sanitation
Consume imported, fresh, unwashed, and untreated vegetables and fruits

The Centers for Disease Control and Prevention (CDC) have linked several outbreaks of Cyclosporiasis to basil, cilantro, raspberries, mesclun lettuce, and sweet peas.

Potential Issues

Chronic diarrhea may cause dehydration and the loss of important minerals. The following may occur:

Severe dehydration
Electrolyte imbalances
Blood volume loss
Weakness and malnutrition

Children, older persons, and the immunocompromised are at higher risk for these problems.

Diagnosis and Tests

To diagnose cyclosporiasis, your provider will review your symptoms and medical history, including recent travels and your diet. They will likely complete a physical examination and order some tests.

The main test will be a stool sample. Because the parasite may not be present in every sample, your provider may ask you to provide several samples collected over a number of days. This will help them to identify Cyclospora cayetanensis.

Diagnosis can be difficult but is necessary to prevent the complications of prolonged diarrhea.

Management and Treatment

How Is Cyclosporiasis Treated?

To treat cyclosporiasis, your provider will prescribe antibiotics. The most commonly prescribed medication is trimethoprim-sulfamethoxazole (TMP-SMX) because it is very effective against this parasite.

If you are allergic to sulfa medications, it may be possible to use the antibiotics nitazoxanide or ciprofloxacin. This will be dependent on your provider.

Supportive care is an important factor in recovery. It includes things like:

Drinking lots of water
Using oral electrolyte solutions or substitute sports drinks
Taking antidiarrheal medications as instructed by a doctor
Receiving IV fluids for severe dehydration

Can It Go Away on Its Own?

Some cases of cyclosporiasis can be self-limiting. However, the untreated cases of infection can last for over a month, and it becomes increasingly likely that the patient will become dehydrated and have worsening, recurrent symptoms. It is a good idea to see a doctor when persistent watery diarrhea occurs.

Recovery Time

People starting to feel better about 1 to 2 weeks after treatment is started. Episodes of diarrhea can continue for weeks after treatment.

When Should You See a Doctor?

If you have:

Frequent watery diarrhea for a few days
Signs of dehydration
Symptoms that get worse after treatment
Severe Diarrhea and a Weak Immune System

See a doctor. Treatment can make your symptoms get better, and it lessens the chance of complications.

Treatment and Prognosis

The prognosis for most healthy adults with cyclosporiasis is excellent because of infection management and the lack of long-term health problems.

Infections and poor health in the immunocompromised can be prolonged and of poor prognosis. Treatment is very important for recovery. Keeping fluids up and a good diet is important for recovery.

Prevention

Although avoidance of infection can be difficult, there are a number of ways to significantly reduce personal risk of infection.

You can help to prevent infection by:

Thoroughly washing your hands with soap and water after using the toilet and before eating.
Washing your fruits and veggies before consumption.
Peeling your produce whenever possible.
Washing your kitchen surfaces and utensils, as well as cutting boards, frequently.
Drinking only treated and filtered water while traveling.

Not going swimming when you have diarrhea. You should also wait at least two weeks after your diarrhea symptoms have gone before entering pools and other water related places.

Overall, practicing food and water hygiene will help you the most in prevention of bacterial infection.

Conclusion

Cyclosporiasis is a parasitic infection that is most known for causing the symptom of diarrhea that is watery, and is also known for causing post consumption gut distress. It is most often the result of the ingestion of food and/or water that has been contaminated.

Most cases resolve themselves within a reasonable time for the healthy. It is imperative to prompt to diagnose and treat to avoid the symptoms extending and the patient suffering with painful and distressing dehydrating diarrhea. It is imperative to practice and elementarily maintain personal hygiene. If the distressing symptoms do not subside or worsen, one should seek the help of a healthcare professional.