Increase in Cyclosporiasis Cases in Massachusetts

Massachusetts has reported eighteen cases of cyclosporiasis from May 1 to July 1, coinciding with a broader outbreak affecting much of the Midwest. Infections from the Cyclospora parasite, known for causing diarrhea, are on the rise, and some state data indicates that 2026 might already be the worst year for reported cases nationwide.

Dr. Zoe Weiss, an infectious disease specialist at Tufts Medical Center, noted that while states like Michigan and Ohio have seen outbreaks exceeding 3,000 cases, she doesn’t anticipate a similar situation in Massachusetts. According to the state’s Department of Public Health, the number of reported cases aligns with typical figures for Massachusetts during this season.

Weiss mentioned, “It’s likely that Massachusetts won’t experience as many cases as seen in areas like Michigan, which are already reporting thousands.” This might be a relief for residents, although, of course, any number is concerning.

So, how does one contract Cyclospora? Well, it can happen through the consumption of fresh, uncooked produce contaminated with the parasite. Foods like raspberries, bagged lettuce, cilantro, scallions, snow peas, and fresh basil have been associated with recent cyclosporiasis cases.

This parasite thrives in warm conditions, infecting the intestines and spreading through fecal contamination. Historically, infections have occurred when people ingest fruits or vegetables irrigated with contaminated water. As the investigation into these outbreaks continues, Taco Bell has announced it will start removing certain ingredients from its menu as a precautionary measure.

Doctors point out that diagnosing Cyclospora can be complex; symptoms typically take weeks to manifest. It might be hard for patients to recall everything they ate, making it even trickier to trace the source of the infection.