Largest Cyclosporiasis Outbreaks in US History

Cyclosporiasis outbreaks have become more frequent in the US since the 2010s, with some notable cases impacting thousands of people across multiple states.

The top 3

  1. 2026 Multi-State Outbreak: Over 18,000 Cases: The current 2026 U.S. cyclosporiasis outbreak is the largest in recorded history, with over 18,000 confirmed or suspected cases across 45 states as of August 3, 2026, with Michigan being particularly hard-hit with over 11,200 cases.
  2. 1996 North American Raspberry Outbreak: 1,465 Cases: One of the earliest significant outbreaks, linked to contaminated raspberries, occurred in 1996, affecting 1,465 individuals across 20 U.S. states and Canada.
  3. 2015 Texas Cilantro Outbreak: 546 Cases: In 2015, a significant outbreak in Texas, with 546 confirmed cases across 31 states, was primarily linked to contaminated cilantro.

Sources

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