What Is Cyclosporiasis?

Cyclosporiasis is an intestinal illness caused by a microscopic parasite called Cyclospora cayetanensis. You get it by consuming food or water contaminated with the parasite, and it can lead to watery, sometimes explosive diarrhea along with other symptoms. Cases tend to rise each spring and summer.

What are the symptoms of cyclosporiasis?

Symptoms usually begin about one week after you ingest the parasite (though can range from as soon as a few days on the shorter end to 2 weeks or more on the longer end). The most common sign is frequent, watery and sometimes explosive diarrhea.

Other symptoms include:

• Stomach cramps
• Bloating
• Nausea
• Loss of appetite
• Weight loss
• Fatigue
• Low-grade fever

Symptoms can last for days or even weeks, and they may come and go. If left untreated, the illness can return in cycles.

How do you get cyclosporiasis?

You get cyclosporiasis by consuming food or water that has been contaminated with feces containing the Cyclospora cayetanensis parasite. Fresh produce is a common source, especially items eaten raw, such as berries, herbs like basil or cilantro and salad greens.

The parasite is not spread directly from person to person. It needs time in the environment to become infectious, which is why contaminated food and water are the main concern.

When is cyclosporiasis season?

The Centers for Disease Control and Prevention (CDC) considers May 1 through Aug. 31 the yearly "cyclosporiasis season," so in late spring and summer pay close attention to digestive symptoms, especially after eating fresh produce.

How is cyclosporiasis diagnosed?

Confirmation of cyclosporiasis requires specific lab testing that your healthcare team can order.

If you have persistent or severe diarrhea, tell your doctor about your symptoms and any recent travel or foods you ate. This information helps guide the right testing.

How long does cyclosporiasis last?

While the infection can eventually clear on its own in some people, it can take weeks or longer and symptoms often come and go in cycles. Prescription treatment typically clears the infection within days. 

How is cyclosporiasis treated?

Cyclosporiasis is treated with a common prescription antimicrobial pill. 

Your healthcare team can confirm the diagnosis through lab testing and prescribe the appropriate treatment. Staying hydrated is also important while you recover.

How can you prevent cyclosporiasis?

The Cyclospora parasite is resistant to standard washing and chemical disinfection, so thoroughly rinsing fresh produce reduces but does not eliminate risk. If you travel to tropical areas, take extra care with food and water sources.

Can children get cyclosporiasis?

Yes. Children can get cyclosporiasis by eating or drinking food or water contaminated with the parasite, just like adults. Because young children can become dehydrated quickly with diarrhea, watch closely for signs like reduced urination, dizziness or unusual tiredness and contact your child's doctor right away if you notice them.

When should you see a doctor?

Contact a healthcare provider if you have frequent watery diarrhea, stomach cramps or other symptoms that last more than a day or two. Prompt testing and treatment can shorten your illness and help you feel better sooner.

You should seek immediate care if you have signs of dehydration, such as dizziness, reduced urination or extreme fatigue.

You do not have to guess your way through stubborn stomach symptoms. Ochsner Health connects you with trusted doctors who can evaluate your symptoms, order the right testing and create a treatment plan that fits your needs.

Schedule an appointment with Ochsner Health online or by logging in to MyOchsner.