Public health agencies are currently investigating a significant increase in cyclosporiasis cases across the United States, with a particular concentration of infections reported in the Midwest.

公共衛生機構目前正在調查美國各地環孢子蟲病病例的顯著增加，其中中西部報告的感染病例尤為集中。

The current epidemiological surge is characterized by a wide geographic distribution, with reports spanning 31 states. Michigan has experienced the most acute impact, recording over 1,500 cases—a substantial deviation from its historical annual average of approximately 50. Other notable clusters have emerged in Ohio, New York, and Illinois. The pathogen, Cyclospora cayetanensis, is a microscopic parasite transmitted via the fecal-oral route, typically through the ingestion of contaminated water or fresh produce. Clinical manifestations primarily include severe gastrointestinal distress, specifically frequent and watery diarrhea, often accompanied by nausea, fatigue, and abdominal cramping. While the infection is rarely fatal, it may persist for several weeks without the administration of antibiotics such as trimethoprim-sulfamethoxazole.

目前的流行病學飆升其特點是地理分佈廣泛，報告涵蓋 31 個州。密西根州受影響最為嚴重，記錄超過 1,500 例病例——與其歷史年平均約 50 例相比，偏差極大。俄亥俄州、紐約州與伊利諾州也出現了其他顯著的集群。該病原體，即環孢子蟲 (Cyclospora cayetanensis)，是一種透過糞口途徑傳播的微小寄生蟲，通常經由攝取受污染的水或新鮮農產品而感染。臨床表現主要包括嚴重的胃腸道不適，特別是頻繁的水樣腹瀉，通常伴隨噁心、疲勞與腹部絞痛。雖然此感染極少致命，但若不使用 trimethoprim-sulfamethoxazole 等抗生素治療，可能會持續數週。

Trace-back efforts are complicated by several systemic and biological factors. The parasite's incubation period, which ranges from two days to two weeks, often precludes accurate patient recall of food consumption. Furthermore, the globalization of the food supply chain facilitates the distribution of contaminated produce from tropical or subtropical regions to diverse domestic markets. Historically, outbreaks have been linked to commodities such as basil, cilantro, raspberries, and bagged salad mixes. Despite these antecedents, the Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) have not yet identified a specific grower or product as the source of the current infections.

追溯調查受到多項系統性與生物學因素的影響而變得複雜。寄生蟲的潛伏期為兩天至兩週，通常導致患者無法準確回憶食物攝取情況。此外，食物供應鏈的全球化促進了受污染農產品從熱帶或亞熱帶地區分發至各類國內市場。歷史上，爆發事件與羅勒、香菜、覆盆子及袋裝沙拉混和物等商品相關。儘管有這些前例，美國食品藥品監督管理局 (FDA) 與疾病控制與預防中心 (CDC) 尚未確定特定的種植者或產品為此次感染的來源。

Institutional capacity for surveillance has been a subject of professional scrutiny. The transition of the Foodborne Diseases Active Surveillance Network (FoodNet) to an optional reporting structure for certain pathogens in 2025, alongside the dissolution of the CDC's Division of Parasitic Diseases and Malaria, has been cited by some experts as a potential impediment to rapid outbreak identification. While the CDC maintains that its handling of cases remains consistent, critics suggest these administrative reductions may have contributed to data lags and a reliance on fragmented state-level reporting.

監測的機構能力一直是專業審視的焦點。食物傳播疾病主動監測網絡 (FoodNet) 於 2025 年將某些病原體轉為選擇性報告結構，加上 CDC 寄生蟲病與瘧疾分部的解散，被部分專家認為是導致爆發識別緩慢的潛在阻礙。雖然 CDC 主張其處理病例的方式保持一致，但批評者認為這些行政縮減可能導致數據滯後，且過度依賴碎片化的州級報告。

Federal and state authorities continue to monitor the situation and advise rigorous food hygiene practices to mitigate further transmission.

聯邦與州政府當局將繼續監控情況，並建議採取嚴格的食物衛生措施以減輕進一步傳播。