Michigan health authorities are investigating a rapidly expanding outbreak of cyclosporiasis after more than 170 people were diagnosed with the parasitic illness over a nine-day period.
The number of infections is significantly higher than the state’s annual average of about 50 cases, prompting officials to launch an extensive public health investigation. Authorities said additional cases are expected as surveillance continues.
Multiple Counties Affected Across the State
The outbreak has spread across numerous parts of Michigan, with confirmed infections reported in Monroe, Lenawee, Washtenaw, Wayne, Livingston, Jackson and Shiawassee counties, as well as several other counties and the City of Detroit.
Monroe County has recorded the highest number of cases, reporting 70 infections. Lenawee County follows with 33 cases, while Washtenaw County has identified 21. Wayne County has reported 12 cases, and both Jackson and Shiawassee counties have confirmed seven infections each. Another 24 cases have been documented across 11 additional counties and Detroit.
Patients Range Widely in Age
According to the Michigan Department of Health and Human Services, those infected range in age from eight to 84 years old.
Officials said the average patient is 44 years of age, while the median age among those affected is 41.
Investigators Yet to Identify Source
Public health officials have not determined what caused the outbreak or whether all reported cases are linked to the same source.
Cyclosporiasis is caused by the parasite Cyclospora cayetanensis, which is typically transmitted through food or water contaminated with human fecal matter.
Although previous outbreaks in the United States have frequently been associated with contaminated fresh produce during the summer months, investigators have not identified any specific food item connected to the Michigan cases.
Symptoms Can Persist Without Treatment
The illness generally develops between two and 14 days after exposure to the parasite.
Common symptoms include prolonged watery diarrhoea, abdominal cramps, bloating, nausea, reduced appetite, weight loss and low-grade fever.
Health officials noted that the infection is not believed to spread directly from one person to another.
Residents Encouraged to Seek Medical Care
Authorities are advising anyone experiencing persistent diarrhoea, particularly if multiple members of the same household become ill, to consult a healthcare provider promptly.
Doctors can treat cyclosporiasis with antibiotics, which often shorten the duration and severity of symptoms. Without treatment, infections may continue for several weeks or even longer.
Public Asked to Assist Investigation
State and local health departments are interviewing infected individuals in an effort to identify common exposures and determine the source of the outbreak.
Officials have urged diagnosed patients to cooperate fully with investigators to help establish whether the illnesses are connected.
In the meantime, residents are being reminded to reduce the risk of foodborne illness by thoroughly washing fruits and vegetables under running water before eating or preparing them, scrubbing firm produce such as cucumbers and melons, removing damaged portions, and refrigerating prepared produce promptly.
