Parasite Infects Hundreds in US, Causing 'Explosive Diarrhea'

A microscopic parasite, Cyclospora cayetanensis, is circulating across the United States, infecting hundreds and causing significant gastrointestinal distress, including severe diarrhea. The parasite primarily affects the small intestine, leading to symptoms that can last for weeks if left untreated.

According to the U.S. Centers for Disease Control and Prevention (CDC), Cyclospora is typically transmitted through the consumption of contaminated food or water, rather than direct person-to-person contact. Symptoms include watery diarrhea, with "frequent and sometimes explosive" bowel movements. The CDC has reported cases spanning 31 of the 50 states, though the exact source and interconnectedness of these cases are still under investigation.

Epidemiologists have raised concerns about the parasite's spread. While the origin of the current outbreak is undetermined, health authorities in Michigan have reported a significant surge, with over 1500 cases registered, a stark contrast to the usual 50 cases per year in the state. In New York, 470 cases have been identified since May 1, though state health officials noted this number does not represent a significant deviation from typical seasonal figures.

Cyclospora outbreaks commonly occur in the summer and are often linked to the consumption of fresh fruits and vegetables such as raspberries, blackberries, strawberries, blueberries, basil, and cilantro. The parasite's oocysts can survive outside the host for extended periods, making contaminated produce a likely vector. While the infection is generally not fatal, health authorities warn of the risk of dehydration due to prolonged diarrhea.