Public health officials and food-safety experts are urging Americans to thoroughly wash fresh produce to reduce the risk of cyclosporiasis infection.
This guidance comes as a parasite outbreak spreads across the U.S., highlighting vulnerabilities in the food supply chain and the necessity of home hygiene to prevent severe diarrheal illness.
The illness is caused by the parasite Cyclospora cayetanensis [1, 2]. Health officials have detected cyclosporiasis in 34 U.S. states [3]. The outbreak has seen a significant spike in cases since late June 2026 [4, 5].
In Michigan, the impact has been particularly severe. More than 3,300 residents in that state have been sickened since late June 2026 [4]. Nationally, thousands of Americans have reported cases of the illness [5].
Experts said that proper washing techniques are critical for mitigating risk. While some produce is pre-washed, officials said that additional rinsing at home can help remove contaminants that lead to infection [1, 2]. This is especially important for leafy greens and fresh vegetables, which are often linked to such outbreaks [2].
Cyclosporiasis typically manifests as a prolonged diarrheal illness [1]. Because the parasite is hardy, it can survive on fresh produce during transport and handling. The current surge in cases has led to increased scrutiny of lettuce and other raw vegetables [2, 4].
Officials said to use clean, running water to rinse produce thoroughly. They said against relying solely on commercial pre-washing labels when an active outbreak is occurring. Following these steps can help break the chain of transmission from contaminated fields to the consumer's plate [1, 3].
“More than 3,300 Michigan residents have been sickened since late June 2026”
The widespread nature of this outbreak, spanning 34 states, suggests a systemic contamination issue likely originating from a common commercial source. By shifting the focus to home-washing guidance, health officials are attempting to create a final line of defense for consumers while the specific source of the Cyclospora cayetanensis parasite is identified and mitigated.
