美国疾病控制与预防中心(CDC)7月14日报告，美国半数以上的州正面临由一种食源性寄生虫引发的胃肠道疾病疫情。据CDC统计，全美34个州已记录了近7000起环孢子虫病（cyclospora）确诊或疑似病例。这是一种由微小寄生虫引发的感染。CDC部门负责人说，这种疾病通过食用或饮用受寄生虫污染的食物或水传播，通常涉及未充分清洗或烹饪的新鲜农产品，症状包括严重腹泻、食欲不振、发烧和呕吐。密歇根州卫生部门怀疑，感染源与沙拉和生菜有关。据报，美国快餐连锁店塔可钟（Taco Bell）正在接受卫生部的调查。密州的一些塔可钟快餐店已采取预防措施，停止供应生菜。
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