Cyclosporiasis Outbreak Hits 32 States With Thousands of Confirmed Cases

Nationwide Cyclosporiasis Outbreak Reaches 32 States

Federal health authorities are tracking a significant surge in cyclosporiasis, an intestinal illness caused by the parasite Cyclospora. As of July 2026, reports have confirmed at least 2,944 cases across 32 states. While the Centers for Disease Control and Prevention (CDC) is actively investigating the outbreak, the specific source or sources of the contamination have not yet been identified.

The true scale of the outbreak is likely higher than official figures suggest. Health officials note that the current data only reflects cases reported directly to the CDC. Many individuals may recover without seeking medical care, and there is an estimated six-week lag between the onset of illness and its inclusion in federal reporting. As of mid-July, at least 86 hospitalizations had been documented nationwide, though no deaths have been reported.

Regional Impact and Distribution

The impact of the current outbreak varies significantly by state. Michigan has emerged as a primary area of concern, reporting 1,562 cases—a figure described by state health officials as 31 times higher than their typical annual average. Other states reporting high case counts include New York, with 470 cases, and Ohio, which reported 364 infections.

In New Hampshire, the Department of Health and Human Services has confirmed two cases. Historically, the state identifies between two and nine cases annually. Other states, including California, Florida, and Illinois, have also reported infections since the start of May.

Understanding the Illness and Symptoms

Cyclosporiasis is a gastrointestinal affliction transmitted when individuals consume food or water contaminated with feces containing the parasite. The most common symptom is watery diarrhea, which the CDC describes as frequent and sometimes explosive. Other reported symptoms include fatigue, nausea, vomiting, abdominal cramping, and bloating.

Symptoms typically appear about one week after infection, though the timeline can range from two days to two weeks or more. This delay often complicates efforts by investigators to identify the specific food items responsible for the illness, as patients may struggle to recall everything they consumed during the exposure window.

For more on this story, see Cyclosporiasis Outbreak Hits 32 States With Nearly 3,000 Reported Cases.

Diagnostic Challenges

Medical professionals emphasize that identifying this parasite is not straightforward. Dr. Dilip Yarabothu, Medical Director of Southern New Hampshire Health Immediate Care, notes that Cyclospora does not appear on standard parasite screens.

“They sometimes may have to ask the patient to essentially collect a sample three times, like 2 to 3 days apart, because the parasite itself is not constantly being shed,” Dr. Yarabothu explained. Because the shedding of the parasite and the resulting symptoms can be intermittent, patients are advised to seek medical attention if they experience persistent diarrhea, dehydration, or worsening abdominal pain. When diagnosed, the infection is typically treated with antibiotics.

Prevention and Food Safety

While the specific source of the current surge remains under investigation, previous outbreaks have been linked to fresh produce, including raspberries, basil, cilantro, snow peas, and various types of lettuce.

To mitigate risk, health officials recommend the following precautions:

* Thorough Washing: Wash all fresh produce and herbs thoroughly, though officials acknowledge that parasites can be difficult to rinse off.
* Proper Preparation: Cook produce to at least 158 degrees Fahrenheit, which is effective at killing the parasite.
* Hygiene: Wash hands with soap and water before and after handling raw fruits and vegetables.
* Handling: Cut away bruised or damaged parts of produce and refrigerate any pre-prepared or pre-cut items.

Dr. Bruce Vanderhoff, director of the Ohio Department of Health, urged the public to take the illness seriously, noting that it can lead to severe dehydration and require emergency medical intervention. While the current surge has prompted increased vigilance, experts remind the public that the illness is not new and remains a manageable condition when treated promptly.

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