Illinois

Illinois is experiencing active cyclosporiasis transmission, a clinically significant gastrointestinal infection that can cause prolonged, relapsing watery diarrhea and dehydration. As of 2026-08-21, 1,437 cases have been confirmed and the trend is increasing; no deaths are reported in the available data. The overall public health impact is high given the substantial and growing case burden. No evidence of multi-pathogen co-circulation is documented in the provided reports, and the pattern indicates sustained ongoing transmission of a single pathogen.

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