Cyclosporiasis (caused by the parasite Cyclospora cayetanensis) is considered particularly troublesome because it’s difficult to detect, can last for weeks or months if untreated, and isn’t killed by simply rinsing produce with water.

Why is cyclosporiasis considered so bad?

🤢 It causes prolonged illness

Unlike many foodborne illnesses that resolve within a few days, cyclosporiasis can linger for weeks or even monthswithout treatment. Symptoms often come and go, making people think they’re recovering before the illness returns.

Common symptoms include:

• 💩 Frequent watery diarrhea

• 🤕 Stomach cramps and bloating

• 🤢 Nausea and vomiting

• 😴 Extreme fatigue

• 🤒 Low-grade fever

• ⚖️ Weight loss

• 🚽 Loss of appetite

🔬 It’s caused by a parasite

The illness is caused by the microscopic parasite Cyclospora cayetanensis, which infects the small intestine.

One unusual feature is that people don’t become infected directly from someone who is sick. The parasite must spend time in the environment before it becomes infectious, so outbreaks are usually linked to contaminated food or water rather than person-to-person spread.

🥗 It’s often linked to fresh produce

Foods frequently associated with outbreaks include:

• Leafy greens

• Bagged salads

• Cilantro

• Basil

• Parsley

• Raspberries and blackberries

• Snow peas

Because these foods are often eaten raw, the parasite can survive all the way to your plate.

Why is it difficult to prevent?

• 🚿 Rinsing with water may reduce dirt but won’t reliably remove Cyclospora.

• ❄️ Refrigeration does not kill the parasite.

• 🧴 Household vinegar or produce washes have not been proven to eliminate it.

• 👀 You can’t see, smell, or taste the parasite.

How can you reduce your risk?

✅ Wash produce carefully

Although washing won’t guarantee removal, it can help reduce contamination from dirt and other germs.

🥬 Inspect fresh produce

Throw away produce that looks damaged, spoiled, or has signs of contamination.

🍽️ Cook foods when possible

Heat kills the parasite, so cooked vegetables are generally safer than raw ones.

🚰 Drink safe water

When traveling in areas with poor sanitation, drink bottled or properly treated water and avoid ice made from unsafe water.

📰 Pay attention to recalls

Many outbreaks are traced to a specific farm or distributor. If a recalled product is in your home, discard it immediately.

🩺 Seek medical care if symptoms persist

If diarrhea lasts more than a few days—especially after eating fresh produce—see a healthcare provider. Cyclosporiasis is treated with the prescription antibiotic combination trimethoprim-sulfamethoxazole (TMP-SMX), which is highly effective for most people.

Who is most at risk?

People may experience more severe illness if they are:

• 👶 Young children

• 👵 Older adults

• 🤰 Pregnant women

• 🛡️ People with weakened immune systems (such as those receiving chemotherapy or taking immune-suppressing medications)

Bottom line

Cyclosporiasis isn’t usually life-threatening for healthy people, but it can be extremely debilitating because the diarrhea and fatigue can persist for weeks if left untreated. The best defenses are buying produce from reputable sources, washing it before eating, following food recall notices, and seeking medical care if symptoms develop after eating fresh fruits or vegetables.