2026年6月3日 / 美国东部时间晚上10:00 / 哥伦比亚广播公司新闻
美国农业部周三证实，德克萨斯州出现了食肉性新大陆螺旋锥蝇。
美国农业部表示，此次受影响的仅为德克萨斯州扎瓦拉县一头3周大的小牛，其脐部被检测出螺旋锥蝇幼虫。
美国农业部表示，将立即采取行动根除这种寄生蝇：在发现地点周围划定12英里的“疫区”并实施检疫，在边境沿线增加螺旋锥蝇诱捕装置，并与德克萨斯州动物健康委员会联合成立事件指挥小组。
“自中美洲和墨西哥的病例开始增加以来，美国农业部一直在大力投入所需工具以消灭新大陆螺旋锥蝇。美国此前曾击败过这种害虫，我们也将再次做到。”美国农业部负责营销和监管项目的副部长达德利·霍金斯说道。
美国农业部此前曾表示，上周在距离美国边境仅25英里的墨西哥境内发现了一只螺旋锥蝇。据联邦数据显示，这是至少自去年9月以来距离美国本土最近的一次相关发现。
美国农业部周三早些时候在社交媒体上发文称，已将德克萨斯州此次病例的样本送往位于艾奥瓦州埃姆斯的美国农业部国家兽医服务实验室，以确认是否为新大陆螺旋锥蝇。
美国农业部表示，墨西哥境内已发现至少26216例螺旋锥蝇病例，其中仍有超过2700例处于活跃状态。
据美国农业部介绍，新大陆螺旋锥蝇幼虫会寄生在家畜和其他温血动物体内，极少数情况下也会感染人类。根据美国疾病控制与预防中心的说法，这种寄生蝇会将卵产在开放性伤口或眼、耳、鼻、口等孔窍处，幼虫孵化后会啃食活体组织或肌肉。
螺旋锥蝇通常通过开放性伤口侵入动物体内，以其活肉为食。
美国疾病控制与预防中心表示，新大陆螺旋锥蝇通常分布在南美和加勒比部分地区，但在过去三年里，在中美洲和墨西哥更北部的区域也发现了它们的踪迹。
美国卫生与公众服务部当时宣布，去年美国确诊了首例人类感染新大陆螺旋锥蝇的病例。该患者已康复，调查人员未发现任何人际或动物间传播的证据。
艾米丽·梅·查霍尔对本文亦有贡献。
Flesh-eating New World screwworm found in Texas calf, USDA says
June 3, 2026 / 10:00 PM EDT / CBS News
The U.S. Department of Agriculture confirmed the presence of a flesh-eating New World screwworm in Texas on Wednesday.
The USDA said the only animal affected was a 3-week-old calf in Zavala County, Texas, after larvae were identified in its umbilical area.
The USDA said it’s taking immediate action to eradicate the parasitic fly by establishing a 12-mile “infested zone” around the detection site and implementing quarantines, increasing traps for screwworms along the border and establishing an Incident Command Team with the Texas Animal Health Commission.
“USDA invested heavily in the tools needed to eliminate NWS ever since cases started increasing in Central America and Mexico. The United States has defeated this pest before, and we will do it again,” said Dudley Hoskins, under secretary for marketing and regulatory programs at USDA.
A screwworm was detected last week in Mexico, just 25 miles from the United States border, the USDA previously said. That encounter had been the closest to U.S. soil since at least last September, according to federal data.
The USDA said in a social media post earlier Wednesday that a sample from the case in Texas had been sent to the USDA’s National Veterinary Services Laboratories in Ames, Iowa, for confirmation of New World screwworm.
At least 26,216 screwworm cases have been identified across Mexico, and upward of 2,700 remain active, the USDA said.
New World screwworm maggots can infest livestock and other warm-blooded animals, including, in rare cases, people, according to the USDA. The parasitic fly lays its eggs in open wounds or orifices such as the eyes, ears, nose or mouth, which can then eat living tissue or flesh once they hatch, according to the Centers for Disease Control and Prevention.
The screwworms most often enter an animal through an open wound and feed on its living flesh.
The New World screwworm is typically found in South America and parts of the Caribbean, but over the last three years, it has been detected farther north in Central America and Mexico, the CDC said.
Last year, the first case of a New World screwworm infestation in a human was confirmed in the U.S., the Department of Health and Human Services announced at the time. The person had recovered, and investigators found no evidence of transmission to others or animals.
Emily Mae Czachor contributed to this report.
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