A parasite that causes prolonged and often severe stomach illness has spread much more widely across the United States this summer than earlier figures suggested. Federal health authorities now say cyclosporiasis, the intestinal infection caused by the microscopic Cyclospora parasite, has been confirmed in about 1,600 cases nationwide, a sharp increase from the roughly 145 reported earlier in the season. On top of that confirmed tally, the Centers for Disease Control and Prevention says it is investigating an additional 5,100 possible cases, and believes the wave likely involves several separate outbreaks stemming from different sources.
The New York area, and Long Island in particular, has felt the outbreak acutely. In Suffolk County, health officials have recorded 49 cases of the stomach bug so far this year, a figure that already sits just one case short of the total logged for all of last year. In neighboring Nassau County, 11 cases were reported in the past month alone. The clustering of cases in these suburban counties has made the parasite a growing local concern rather than a distant, abstract statistic.
Health officials say the surge reflects a broader trend, with cyclosporiasis being seen far more often this year than in previous ones. One explanation they point to is the weather itself: when the climate is warmer, the parasite survives and overwinters more frequently, allowing it to persist and spread rather than dying off between seasons. That environmental factor helps explain why the illness has moved from a relatively rare diagnosis to a recurring summer threat.
Cyclosporiasis is not a household name, but its symptoms are hard to ignore. The illness typically brings on watery diarrhea that can be frequent and, as health officials bluntly describe it, sometimes explosive, along with stomach cramps, nausea, loss of appetite and fatigue. The symptoms can persist for weeks and may come and go, sometimes leading people to assume they are simply battling a stubborn stomach bug when in fact a parasite is to blame. Because the illness can drag on, doctors urge anyone with lingering diarrhea to seek medical care.
The parasite is spread not from person to person but through food or water contaminated with the microscopic organism. Officials say the current cases are linked to contaminated food, and in past outbreaks Cyclospora has been traced to fresh produce such as leafy greens, herbs and berries. Because the CDC believes several outbreaks from different sources may be at play, more than one contaminated product or supply chain could be driving the illness, which makes pinning down a single culprit especially difficult.
One reason Cyclospora is so hard to guard against is that it does not wash away easily, resisting the kind of quick rinse many people rely on to clean fruits and vegetables. Even so, officials are urging basic precautions: washing hands thoroughly before and after cooking, and washing fresh produce carefully before eating it. Those steps cannot guarantee protection, but health departments stress that good kitchen hygiene remains an important line of defense while investigators work to trace the source.
The illness is rarely fatal and is treatable with specific antibiotics once it is properly diagnosed, but the steep climb in cases has put health departments on alert. As the CDC and state and county health agencies work to trace the outbreaks to their sources, the surge serves as a reminder that foodborne illness can strike well beyond the usual summer stomach bugs. With New York and Long Island among the hardest-hit areas and the national count still rising, local residents in particular have reason to stay vigilant.