2026-07-14T17:40:00.615Z / 路透社
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7月14日（路透社）——美国食品药品监督管理局周二表示，该局正对包括生菜在内的多种农产品开展溯源调查，官员们正试图确定环孢子虫暴发的源头，同时实验室确认的病例数仍在持续上升。
目前尚无该暴发疫情导致死亡的报告，但据美国疾病控制与预防中心数据，已有141人住院治疗，全美34个州共报告1645例实验室确认病例。该机构表示，还有超过5100份额外报告需要进一步分析和确认。
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据美国疾控中心介绍，环孢子虫是一种肠道传染病，可通过食用被粪便污染的食物——通常是生鲜果蔬——或水而感染。该疾病会引发腹泻、恶心及其他胃肠道症状。
尽管美国此前也曾暴发过这类胃肠道疾病，但今年此次疫情的规模和地理传播范围都显著扩大，引发了卫生官员的担忧。截至目前，官员们尚未确定此次疫情的源头。
“这是一项正在进行且不断演变的调查，”美国疾控中心食源性疾病专家格温·比格斯塔夫说道。
在溯源调查中，官员们会收集患者发病前一周所食用食物的相关信息。
比格斯塔夫对记者表示，美国疾控中心预计病例数将持续增加，可能会延续至8月底。该机构提醒称，从发病到病例报告之间存在约六周的滞后时间，这意味着随着收到更多数据，可能会发现更多感染病例。
此次美国疫情于5月1日开始暴发，疫情中心位于密歇根州，俄亥俄州和纽约州也报告了大量病例。密歇根州卫生官员周二报告该州已有3309例病例，较周一上次更新数据增加了669例。
比格斯塔夫对记者表示，目前收集到的证据表明，密歇根州、西弗吉尼亚州、肯塔基州和俄亥俄州的病例可能与同一源头相关，但这无法解释其他多个州的病例情况。
“目前还有多项其他调查正在进行，包括一些单州调查，以及针对尚未与某一聚集性病例或暴发疫情建立关联的病例开展的调查，”比格斯塔夫说道。
《华盛顿邮报》报道称，联邦和州官员正在调查百胜餐饮集团旗下连锁餐厅塔可钟供应的生菜是否与此次暴发疫情有关。
百胜餐饮集团（纽约证券交易所代码：YUM.N）表示，已出于预防措施在部分餐厅移除了特定食材，并补充称美国卫生官员尚未确认该连锁餐厅与此次疫情存在关联。
明尼苏达大学传染病专家迈克尔·奥斯特霍姆博士表示，鉴于许多农产品的保质期约为三周，此次以密歇根州为中心的疫情可能已经结束。
美国食品药品监督管理局代理食品副专员唐纳德·普雷特承认，农产品在供应链中流通速度很快，但他表示该机构正在调查多个聚集性病例和亚聚集性病例，需要更多信息才能确定疫情是否已经结束。
Siddhi Mahatole 班加罗尔、Bhargav Acharya 多伦多报道；Diti Pujara 编辑
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US cyclosporiasis cases top 1,600 with more cases likely, health officials say
2026-07-14T17:40:00.615Z / Reuters
The U.S. Centers for Disease Control and Prevention’s logo and a U.S. flag are seen in this illustration created on April 23, 2025. REUTERS/Dado Ruvic/Illustration/File Photo Purchase Licensing Rights
July 14 (Reuters) – The U.S. Food and Drug Administration said on Tuesday it was conducting traceback investigations on multiple produce items, including lettuce, as officials try to identify the source of a cyclosporiasis outbreak as the number of lab-confirmed cases continues to rise.
No deaths have been reported from the outbreak, but so far 141 people have been hospitalized, with 1,645 lab-confirmed cases reported across 34 states, according to the U.S. Centers for Disease Control and Prevention. The agency said it was aware of more than 5,100 additional reports that require more analysis and confirmation.
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Cyclosporiasis is an intestinal infection that can be contracted by consuming food — typically raw fruits and vegetables — or water contaminated with feces, according to the CDC. It causes diarrhea, nausea and other gastrointestinal symptoms.
While the United States has experienced outbreaks of the gastrointestinal illness before, the scale and geographic spread of this year’s outbreak are significantly larger, prompting concern among health officials, who have so far officials not pinpointed the source of the outbreak.
“This is an active and evolving investigation,” said Gwen Biggerstaff, a CDC foodborne disease expert.
In traceback investigations, officials collect information from sick people on the foods they ate in the week before they got sick.
The CDC expects that cases will continue to increase, potentially through the end of August, Biggerstaff told reporters. The agency cautioned that there is a roughly six-week lag between the onset of illness and the reporting of cases, which means more infections are likely to be identified as additional data is received.
The current U.S. outbreak, which began on May 1, is centered in Michigan, with Ohio and New York State also reporting high numbers of cases. Michigan health officials on Tuesday reported 3,309 cases in the state, an increase of 669 cases since the last update on Monday.
Biggerstaff told reporters that the evidence collected so far suggests that cases in Michigan, West Virginia, Kentucky and Ohio may be linked to one source, though that does not account for cases in several other states.
“There are a number of other investigations that are going on, some single-state investigations as well as investigations for the cases that are not currently linked to a cluster or outbreak,” Biggerstaff said.
The Washington Post reported federal and state officials are investigating whether lettuce served at Yum Brands’-owned
(YUM.N)
restaurant chain Taco Bell may have been associated with an outbreak.
The company said it has removed certain ingredients at select restaurants for precautionary reasons, adding that U.S. health officials have not confirmed a link to the chain and the outbreak.
Dr. Michael Osterholm, an infectious disease expert at the University of Minnesota, said it is possible that the outbreak centered on Michigan is already over given that many produce items only have a shelf life of about three weeks.
Donald Prater, the FDA’s acting deputy commissioner for food, acknowledged that produce moves through the system quickly, but said the agency is looking at multiple clusters and sub-clusters, and it needs more information before it can determine whether the outbreak is already over.
Reporting by Siddhi Mahatole in Bengaluru and Bhargav Acharya in Toronot; Editing by Diti Pujara
Our Standards: The Thomson Reuters Trust Principles.
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