2026年6月22日 00:02 UTC / 路透社
2026年6月4日，美国得克萨斯州克里斯塔尔城附近的一头小牛被检测出新大陆螺旋蝇感染，美国农业部证实该消息一天后，一头牛正甩动尾巴。路透社/凯莉·格林利/资料图片 购买授权
6月21日（路透社）——美国农业部周日在社交媒体发帖称，得克萨斯州又有三头动物检测呈螺旋蝇阳性，美国本土新大陆螺旋蝇感染病例总数升至15例。
此次美国农业部公告距该国六十年来首次国内螺旋蝇感染事件被发现已近三周，当时得克萨斯州的一头小牛被确认感染。
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新大陆螺旋蝇是一种寄生蝇，会将温血动物啃食致死，可感染家畜、宠物、野生动物，极少数情况下还会感染人类。其幼虫会钻入动物活体组织，造成严重伤口，最终可能导致宿主死亡，给牧场主带来重大经济损失。
美国农业部表示，将在受影响地区继续开展强力根除行动，包括释放数千万只绝育蝇，以阻断螺旋蝇的繁殖。
美国农业部周日晚间在X平台的帖子显示，过去24小时内，得克萨斯州克罗克特县的一头羔羊和爱德华兹县的两头小牛螺旋蝇检测呈阳性。
过去一年来，随着这种害虫在墨西哥向北扩散，得克萨斯州牧场主一直在防备螺旋蝇入境。专家曾预测，大规模爆发可能给该州带来18亿美元的经济损失，并重创野生动物种群。
美国农业部于4月动工兴建一座绝育蝇生产设施，专家称这是对抗该害虫的最佳手段，但该设施要到2027年下半年才能投入使用。
科斯塔斯·皮塔斯与杰克·奎因报道；塞尔吉奥·农、克里斯蒂安·施莫林格与林肯·菲斯特编辑。
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USDA reports three new cases of screwworm, bringing total to 15
June 22, 2026 12:02 AM UTC / Reuters
A cow’s tail swishes, 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/File Photo Purchase Licensing Rights
June 21 (Reuters) – The number of U.S. cases of New World screwworm has risen to 15 after three more animals tested positive in Texas, the Department of Agriculture said in a post on social media on Sunday.
The USDA announcement comes nearly three weeks after the first domestic screwworm infestation in six decades was found in a Texas calf.
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New World screwworm is a parasitic fly that eats warm-blooded animals alive and can infect livestock, pets, wildlife and, in rare cases, people. The larvae burrow into the living tissue of animals and cause severe wounds that can eventually kill, leading to signficant economic losses for ranchers.
The USDA said it will continue aggressive eradication efforts in affected areas, including the dispersal of tens of millions of sterile flies that halt screwworm reproduction.
One lamb in Crockett County and two calves in Edwards County, Texas tested positive for screwworm in the past 24 hours, according to the USDA’s Sunday evening post on X.
Texas ranchers have been bracing for screwworm to cross into the U.S. for the past year, as the pest advanced north in Mexico. Experts have predicted that a widespread outbreak could cost the state $1.8 billion in economic damage and devastate wildlife.
The USDA broke ground in April on a facility to produce sterile flies, which experts describe as the best tool for combating the pest, but it will not come online until late 2027.
Reporting by Costas Pitas and Jack Queen; Editing by Sergio Non, Christian Schmollinger and Lincoln Feast.
Our Standards: The Thomson Reuters Trust Principles.
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