Cases of cyclosporiasis are rising sharply across the United States, with the latest state report showing a dramatic jump in Michigan alone.
Michigan sees 69% surge in confirmed infections
On July 13, Michigan’s health department announced 2,640 confirmed cases of the parasite, up from 1,562 just three days earlier. The increase represents a 69% rise in a single weekend, according to the state’s latest bulletin. Hospitalizations have remained steady, with no new admissions reported since the previous week.
National picture reflects growing outbreak
Federal data from the CDC’s surveillance report shows 843 cases nationwide as of July 9. Among those, 86 people required hospital care, though no deaths have been recorded. In total, the illness has been reported in 31 states, and every patient said they ate food in the United States without traveling abroad in the two weeks before falling ill.
Michigan’s numbers now exceed the national total reported by the CDC, a discrepancy that officials attribute to reporting delays and under‑diagnosis. Many individuals with mild symptoms do not seek medical attention, and laboratory confirmation can take weeks.
Related: Blocked Users Get Sorry Message from Site
Patients range in age from 5 to 88, with a median of 44 years, and 59% of those affected are female. Illness onset dates span from early May through early July, centering around a median onset of June 18.
Because the surveillance system typically records a six‑week lag between symptom onset and case confirmation, health authorities expect the total count to keep climbing as more reports are processed.
Federal investigators, including the CDC and the Food and Drug Administration, are coordinating with state and local health departments to trace the source of several multistate clusters. Some cases are linked to ongoing FDA traceback investigations, while others remain sporadic without an identified common exposure.
The parasite, Cyclospora cayetanensis, thrives in warm, humid environments and often contaminates fresh produce. Outbreaks in the United States have frequently been tied to imported or domestically grown fruits and vegetables that were not properly washed. The lack of lasting immunity means people can be infected repeatedly, complicating public‑health efforts to curb spread.
Transmission occurs when a person consumes food or water tainted with feces containing the parasite. Unlike many gut pathogens, Cyclospora needs 1 to 2 weeks in the environment to become infectious after being shed, which reduces the likelihood of direct person‑to‑person spread.
Related: How Security Guards are Disrupting Healthcare and Safety
Prevention guidance emphasizes thorough hand washing with soap and water before handling produce, rinsing fruits and vegetables under running water, and scrubbing firm items like cucumbers and melons with a clean brush.
While investigators continue to search for the exact food sources behind the current clusters, the rise in Michigan cases calls for increased vigilance among consumers and producers alike.
Symptoms include diarrhea and stomach cramps.
The CDC’s fact sheet on prevention offers additional details on safe handling practices for fresh foods. As the situation evolves, state and federal agencies will update the public with new findings and recommendations.