An intestinal bug that causes severe diarrhea is causing concern among public health officials.
The Centers for Disease Control and Prevention noted 145 cases of cyclosporiasis reported from May 1 to June 16, which includes a notable cluster in Pennsylvania and New Jersey. In Michigan, state health authorities have identified over 1,200 cases as of July 9, while Ohio has confirmed an additional 177 cases by July 2.
The Pennsylvania Department of Health stated there have been 28 cases of cyclosporiasis reported in the state in 2026, with half of those occurring in Southeastern Pennsylvania. Last year, there were 40 cases, and in 2024, the total was 87.
No fatalities from this intestinal infection have been reported this year, and while it’s generally not considered life-threatening, here’s what you should know:
What is cyclosporiasis?
Cyclosporiasis is an illness linked to the cyclospora cayetanensis parasite, which is so tiny that it only becomes visible under a microscope.
This parasite is more commonly found in tropical and subtropical areas, but it can also affect individuals elsewhere through contaminated food or water. In the U.S., foodborne outbreaks are often connected to imported items like basil, cilantro, raspberries, and snow peas.
“Although cases of cyclosporiasis can occur at any time, they tend to increase during the spring and summer months,” a representative from the Pennsylvania Department of Health mentioned in an email.
The CDC indicates that symptoms typically surface about a week after infection.
What are the symptoms of cyclosporiasis?
The primary symptom is watery, sometimes very intense diarrhea. Additional signs can include bloating, cramps, fatigue, increased gas, and a diminished appetite.
Some less common symptoms might involve body aches, a low-grade fever, and vomiting.
If not treated, these symptoms could persist from a few days up to a month or more, and it’s worth noting that some individuals may not exhibit any symptoms at all.
