What is cyclospora? Diarrhoea symptoms, foods linked to US outbreak
The US Centers for Disease Control and Prevention is investigating a cyclospora outbreak with 1,645 confirmed domestically acquired cases since May 1, with over 5,100 additional reports under review. The parasitic infection, spread through contaminated food and water rather than person-to-person contact, typically causes prolonged gastrointestinal symptoms treatable with antibiotics. Fresh produce including leafy greens, herbs, and berries have been linked to past outbreaks, though the current source remains unidentified.
A parasitic infection caused by cyclospora is spreading across the United States, prompting federal health authorities to launch a comprehensive investigation. The Centers for Disease Control and Prevention has documented 1,645 confirmed cases acquired domestically since the beginning of May, while simultaneously reviewing more than 5,100 additional suspected cases to determine their connection to the broader outbreak. Projections suggest case numbers will continue climbing through August.
Cyclospora is a microscopic parasite that infects the intestinal tract, causing an illness known as cyclosporiasis. Infected individuals typically experience gastrointestinal symptoms that can persist for weeks without treatment, though the condition is rarely life-threatening and responds to antibiotic therapy. Unlike many foodborne pathogens, cyclospora does not transmit directly between people; instead, the parasite requires several days to weeks in the environment after leaving the body before it can infect another person.
While cyclospora infections remain less prevalent than illnesses caused by bacteria such as salmonella or E. coli, outbreaks have become increasingly common in the United States over the past decade. Health experts attribute this trend to improved diagnostic testing capabilities and environmental factors, particularly warmer temperatures that enable the parasite to survive longer outside the body.
Contamination occurs when human waste enters the food or water supply. Fresh produce consumed raw—including leafy greens, herbs, berries, and other vegetables—poses particular risk because these items may be exposed to contaminated irrigation or washing water. Previous outbreaks have been traced to lettuce, bagged salad mixes, cilantro, basil, raspberries, snap peas, coleslaw, vegetable trays, and fresh fruit mixes.
The Food and Drug Administration is currently tracing multiple types of fresh produce through supply chains to identify contamination sources. Investigators are interviewing infected individuals about their dietary intake prior to illness onset, then following those foods backward through distributors and suppliers to their points of origin. While Michigan health officials identified lettuce as a possible source, authorities have not confirmed any specific produce item, grower, or supplier as the outbreak cause. Some restaurant chains have implemented precautionary menu modifications pending the investigation's outcome.
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