Michigan reports over 300 cases of cyclosporiasis as outbreak expands
More than 300 cases of the intestinal parasite cyclosporiasis have been confirmed in Michigan, far exceeding the state's typical annual count, while health officials continue investigations into the source.
Michigan health officials said the state has confirmed more than 300 cases of cyclosporiasis, an intestinal infection caused by a parasite that spreads through contaminated food or water. The figure is markedly higher than the roughly 50 cases the state usually records each year, according to the Michigan Department of Health and Human Services (MDHHS).
"We are working closely with our state and local partners to identify the source of this outbreak that is making so many people ill as quickly as possible," MDHHS public information officer Lynn Sutfin told ABC News.
The Centers for Disease Control and Prevention (CDC) reported 145 cases across 17 other states as of mid-June, with at least 20 hospitalizations. Federal, state and local agencies are investigating multiple clusters of the illness.
Experts noted that cyclosporiasis cases typically rise in May, but the current Michigan numbers are unusually high. Dr. Peter Chin-Hong, an infectious-diseases specialist, said domestic cases are becoming more common, whereas in the past most infections were linked to imported produce.
The CDC has associated previous outbreaks with items such as raspberries, basil, snow peas, mesclun lettuce and cilantro. Symptoms appear one to two weeks after exposure and can include watery diarrhea, abdominal cramping, bloating, low-grade fever, nausea and vomiting. While most cases are self-limited, individuals with weakened immune systems may experience more severe illness.
"Though in most cases this illness causes discomfort from cramping, bloating and watery diarrhea, we are concerned about individuals who may be immunocompromised due to cancer treatment or an organ transplant as the effects may be more severe," Sutfin added.
The infection is not easily transmitted from person to person; it requires environmental development before becoming infectious. Treatment typically involves a ten-day course of the antibiotic trimethoprim-sulfamethoxazole. Health officials advise washing produce thoroughly, removing damaged portions and refrigerating pre-cut items to reduce risk.
"If you're in an area that's been affected and you have sudden ongoing watery diarrhea, you should definitely seek a physician and get treatment," Dr. Zoe Weiss said.