A parasitic intestinal infection known as cyclosporiasis is spreading across the U.S. with a notable surge reported this July [1].
The outbreak poses a significant public health risk because the parasite is often transmitted through common fresh produce, making it difficult for consumers to avoid exposure through diet alone [1].
Cyclosporiasis is caused by the parasite Cyclospora cayetanensis [2]. The infection typically produces watery and often "explosive" diarrhea, along with other gastrointestinal symptoms [2].
Health officials said infections have been confirmed in at least 18 U.S. states [3]. The parasite spreads when people consume contaminated fresh produce, such as berries and leafy greens, that has not been properly washed or cooked [1].
Transmission occurs when food handling allows oocysts to become infectious [1]. These oocysts are the hardy stage of the parasite that can survive in the environment until they are ingested by a human host [2].
Because the parasite is often associated with produce sourced from various regions, tracking the exact origin of the contamination can be challenging for health investigators [3]. This complexity often delays the identification of the specific food products responsible for the surge in cases [3].
Medical professionals said the symptoms can be severe and persistent, requiring specific treatment to clear the parasite from the intestinal tract [2]. Public health guidelines recommend thorough washing of produce, though some parasites can resist standard rinsing methods [1].
“Cyclosporiasis is an intestinal infection caused by the parasite Cyclospora cayetanensis”
The widespread nature of this outbreak across 18 states suggests a systemic contamination issue within the produce supply chain rather than a localized farm failure. Because the parasite is linked to staples like berries and leafy greens, the surge highlights the vulnerability of the U.S. food system to waterborne and soil-borne pathogens during the summer months.
