# Rapidly Spreading Cyclosporiasis Outbreak in the US Parasitic infection linked to contaminated lettuce affects over 7,000 people. - **Source:** [Wired](https://www.wired.com) - **Published:** 2026-07-15 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/068bcab2-d7d2-4295-85c3-1f229aa7ce0e ## Scale of the Outbreak Nearly 7,000 cyclosporiasis cases have been reported across the US. This rapidly spreading parasitic infection causes severe diarrhea and digestive issues, with Michigan being the hardest hit. Experts estimate the actual case count is at least double the official numbers due to underreporting. ## Source of Contamination Contaminated lettuce has been identified as the primary source. The cyclospora parasite clings to fresh produce surfaces, particularly raw vegetables like lettuce, herbs, and berries. It resists standard sanitization methods used in food production, making it difficult to eliminate. ## Ongoing Risk Despite restaurant precautions, the parasite's potential spread through water sources could expand the outbreak. Contaminated irrigation water may affect wider crop ranges. Health officials warn cases could eventually appear in all 50 states as the parasite circulates through food distribution networks. ## Diagnostic Challenges Cyclosporiasis presents diagnostic difficulties as it's not routinely tested for in standard lab panels. Mild cases often go unreported. The illness can cause debilitating, weeks-long diarrhea episodes that significantly impact daily life for those affected. ## Industry Measures Food manufacturers are strengthening produce washing protocols, but the parasite's sticky oocysts resist conventional cleaning methods. Chains like Taco Bell have removed suspect ingredients as a precaution. However, proper home food handling remains critical for prevention. ## Public Health Threat Experts warn cyclospora may become endemic in the US. If the parasite contaminates water supplies, outbreaks could become more frequent and widespread. The public is advised to thoroughly wash raw produce and seek medical attention for persistent symptoms to help contain the outbreak. ## Sources covering this story - https://www.wired.com/story/explosive-diarrhea-outbreak-about-to-get-bigger/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._