2026年6月8日 13:02 UTC / 路透社
[1/3]2026年6月4日，美国得克萨斯州克里斯托爾城附近，在美国农业部确认得克萨斯州一头小牛感染新大陆螺旋锥蝇的次日，一头奶牛在牧场吃草。路透社/凯莉·格林利·珀查斯 授权转载
- 美国农业部确认新增螺旋锥蝇病例，此前上周已报告两例
- 这种食肉寄生虫威胁动物健康，极少感染人类
- 当局加强防控措施，阻止疫情从墨西哥扩散
2026年6月8日（路透社）——美国农业部周一确认得克萨斯州新增两例新大陆螺旋锥蝇感染病例，分别涉及拉萨尔县的一头小牛和安德鲁斯县的一只狗。
美国农业部表示，目前正对两起病例开展流行病学调查。
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美国农业部表示，新大陆螺旋锥蝇是一种害虫，会威胁家畜、宠物、野生动物的健康，极少数情况下会感染人类。
美国农业部上周五在得克萨斯州确认了第二例这种食肉寄生虫感染病例，其发现地点距离上周公布的美国数十年来首例螺旋锥蝇感染地仅数英里之遥。
积极协调的应对措施
螺旋锥蝇是一种蝇类，雌蝇会在温血动物的开放性伤口产卵。幼虫孵化后会钻入活体组织，啃食肌体，如果不及时治疗，可能导致宿主死亡。
这种寄生虫一年多来一直在墨西哥境内向北扩散。
美国已禁止进口牲畜超过一年，以阻止该寄生虫传入边境各州。为遏制其在墨西哥境内的扩散，美国已投入数百万美元，用于建设无菌蝇生产设施、扩大诱捕范围、加强牲畜监测等防控措施。
美国农业部与得克萨斯州动物健康委员会（TAHC）表示，双方正牵头开展积极协调的应对工作。
美国农业部称，目前共有75名人员在现场开展工作，另有数百人提供实验室诊断、后勤保障、治疗物资分发、航空作业、宣传推广与规划支持。
该机构补充称，其将继续在受影响区域及周边区域投放无菌蝇。
本报道由孟加拉鲁的阿努什丽·慕克吉、阿娜雅·阿尼尔与阿西塔·希瓦普拉萨德采写。
斯里拉吉·卡卢维拉与马克·波特编辑
我们的报道准则：汤姆森路透社信任原则。
USDA confirms two more cases of New World screwworm in the US
June 8, 2026 1:02 PM UTC / Reuters
[1/3]A cow grazes in a field a day after the U.S. Department of Agriculture confirmed that New World screwworm was detected in a Texas calf, near Crystal City, Texas, U.S., June 4, 2026. REUTERS/Kaylee Greenlee Purchase Licensing Rights
- USDA confirms new screwworm cases, after first two last week
- Flesh-eating parasite threatens animals, rarely humans
- Authorities step up controls to stop spread from Mexico
June 8 (Reuters) – The U.S. Department of Agriculture on Monday confirmed two more cases of New World screwworm in Texas, involving a calf in La Salle County and a dog in Andrews County.
The USDA said epidemiological investigations are ongoing in both cases.
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New World screwworm is a pest that threatens livestock, pets, wildlife, and, in rare cases, people, the USDA said.
A second case of the flesh-eating parasite was confirmed in Texas by the USDA on Friday, emerging just miles from where the first U.S. detection in decades was reported last week.
AGGRESSIVE, COORDINATED RESPONSE
Screwworms are flies whose females lay eggs in open wounds on warm-blooded animals. Once hatched, larvae burrow into living flesh, feeding on tissue and potentially killing the host if left untreated.
The parasite has been moving north through Mexico for more than a year.
The U.S. has closed its borders to cattle imports for more than a year to stop the parasite spreading into border states. To curb its advance through Mexico, the U.S. has invested millions of dollars in measures such as building sterile fly production facilities, expanding trapping and increased livestock monitoring.
The USDA and the Texas Animal Health Commission (TAHC) said they are leading an aggressive, coordinated response.
A total of 75 people are deployed on the ground, with hundreds more providing laboratory diagnostics, logistics, treatment distribution, air operations, outreach and planning support, the USDA said.
The agency added it is continuing to release sterile flies over and around affected areas.
Reporting by Anushree Mukherjee, Anjana Anil, and Ashitha Shivaprasad in Bengaluru. Editing by Sriraj Kalluvila and Mark Potter
Our Standards: The Thomson Reuters Trust Principles.