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Federal health officials have confirmed 145 cases of cyclosporiasis across 17 states as of mid-June 2026, with no single common source yet identified.
The Centers for Disease Control and Prevention, alongside the Food and Drug Administration and state health authorities, is actively investigating several multi-state clusters of the microscopic Cyclospora parasite — and the outbreak season has months left to run.
What Cyclospora Is and Why Summer Matters Cyclospora is a microscopic parasite that causes cyclosporiasis, an intestinal illness whose defining symptom is watery, frequently "explosive" diarrhea that can persist for weeks or even months without treatment.
Patients also report severe abdominal cramping, bloating, nausea, fatigue, and significant weight loss.
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