Intestinal Parasite Tied to Surge in Severe Diarrhea Across US
2026-07-01
Explosive diarrhea is a blunt phrase, yet it now defines a growing public health problem across the US. At the center is a microscopic parasite, identified in stool by specialized laboratory microscopy and polymerase chain reaction assays, that triggers prolonged intestinal infection rather than a brief stomach upset.
Most people underestimate this illness. Symptoms often begin with subtle loss of appetite, then progress into persistent watery diarrhea, abdominal cramping, bloating, and markedly increased gas that can stretch for weeks if untreated. Weight loss follows as malabsorption and fluid loss erode normal nutrition, while nausea and deep fatigue reflect systemic strain and electrolyte imbalance.
Food, not direct person contact, is the likely vehicle, according to health officials tracking clusters linked to fresh produce and contaminated water. The parasite lodges in the small intestine, disrupting epithelial absorption and altering gut motility, which explains both the explosive stools and the lingering exhaustion that many patients report long after the worst bathroom trips end.
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