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NEJM Evidence· 2026Q1

Cyclosporiasis Outbreak in Michigan, May–July 2026 — An Interim Report

Meena N. Hasan, Heather L. Leahy, Justin Henderson, Jeremy Kuo et al.

Short summary

A cyclosporiasis outbreak in Michigan from May to July 2026 reported 6065 cases across 69 counties, substantially exceeding seasonal norms.

AI-generated from the title and abstract; the full text is not read.

Key points

  • 6065 cases of cyclosporiasis reported in Michigan between May 10 and July 18, 2026.
  • Cases spanned 69 of Michigan's 83 counties.
  • Iceberg lettuce and one restaurant chain identified as potential exposure sources.
  • The number of reported cases substantially exceeded usual seasonal reports.

AI-generated from the title and abstract; the full text is not read.

Abstract

AbstractIn June 2026, Michigan identified a cyclosporiasis outbreak; the number of reported cases substantially exceeded the usual number of seasonal reports. As of July 22, 2026, 6065 cases had been reported across 69 of Michigan's 83 counties, with dates of illness onset ranging from May 10 through July 18, 2026. Food history data, obtained from 51.3% of patients, indicated that iceberg lettuce and consumption at one restaurant chain were potential exposure sources. This report describes Michigan's ongoing outbreak investigation.

The authors' abstract, as published at the source. NEJM Evidence, 2026 · DOI ↗

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ParasitologyImmunology and Microbiology