Health officials race to find the source as infections keep climbing
A stomach parasite outbreak has surged past 3,000 confirmed cases across Michigan and Ohio, with health officials still searching for the source behind one of the worst cyclosporiasis seasons in years. National tallies from health reporters now put the broader cyclospora count above 4,000 cases when combining figures reported directly by individual states.
Michigan has reported 2,640 cases as of Monday morning, including 44 hospitalizations, the state health department said. Ohio has logged 434 cases since June 1, with at least 28 people hospitalized there as well. As of July 10, 31 states had reported cyclospora cases to federal health officials, though it remains unclear whether every case is connected to the same outbreak.
Cyclospora cases surge across two states
Health officials describe the numbers coming out of Michigan and Ohio as unusually high. Michigan typically records only around 40 to 50 cyclosporiasis cases in an entire year, meaning this outbreak already represents tens of times the normal annual total. Ohio has also seen a sharp rise in confirmed infections, particularly across the northwestern part of the state near the Michigan border.
Federal health officials say cases nationwide have climbed noticeably compared with the same period last year, though they have stopped short of describing this as one confirmed, connected outbreak. Investigators continue working to determine whether the surge represents a single contamination source spreading across state lines or several separate clusters happening at once.
What cyclospora is and how it spreads
Cyclospora is a microscopic parasite that causes an intestinal illness known as cyclosporiasis. The infection typically triggers watery, sometimes explosive diarrhea that can last for days or even weeks if left untreated. It is rarely life threatening, and doctors typically treat it with a course of antibiotics alongside rest and fluids.
The parasite spreads through food or water contaminated with fecal matter, most often through fresh produce that was exposed to contaminated irrigation water during growing or handling. Past cyclospora outbreaks have been linked to items such as basil, cilantro, snow peas and bagged salad mixes, though no specific product has been publicly identified as the source of this year’s surge in cyclospora infections.
Part of what makes cyclospora difficult to track is that the parasite cannot be grown in a lab setting, and some standard food poisoning tests do not screen for it directly. That makes pinpointing an exact source, and confirming how many people are truly affected by cyclospora, more difficult than with many other foodborne illnesses.
How to lower your risk right now
Health officials recommend a handful of practical steps while the investigation into the outbreak continues.
- Buy whole heads of lettuce rather than prewashed bagged salad mixes
- Separate and thoroughly wash cilantro and basil leaves under running water
- Trim the root end and peel the outer layer off green onions
- Scrub firm produce such as melons and cucumbers with a clean brush
- Cook vegetables when possible, since heat above 158 degrees kills the parasite
- Wash hands, cutting boards and surfaces before and after preparing food
Anyone experiencing ongoing diarrhea that lasts more than a few days is encouraged to contact a healthcare provider and specifically mention the parasite, since not every standard stool test screens for it automatically.
An investigation still unfolding
Investigators from multiple state and federal agencies continue working to identify what, if anything, connects the cases in Michigan, Ohio and the dozens of other states reporting cyclospora infections this year. Symptoms can take one to two weeks to appear after exposure, meaning cyclospora case counts are likely to keep climbing even if the original source is eventually identified and removed from stores.
For now, health officials say the priority remains protecting the public while the source tracing work continues behind the scenes. Anyone traveling through or living in the affected regions is being urged to stay alert to symptoms and take basic food safety precautions seriously until investigators can narrow down exactly where this cyclospora outbreak began.
Source: CNN
