2026年6月2日 / 美国东部时间下午3:34 / 哥伦比亚广播公司新闻（CBS News）
作者：艾米莉·梅·查霍尔 新闻编辑
艾米莉·梅·查霍尔是CBSNews.com的记者兼新闻编辑，通常报道突发新闻、极端天气和气候相关内容。她此前曾为《洛杉矶时报》、BuzzFeed和《新闻周刊》等媒体撰稿。
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据美国农业部消息，近期在距美国边境仅25英里的墨西哥境内发现了一只食肉性新大陆螺旋锥蝇。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发现。
这只螺旋锥蝇于周四在墨西哥科阿韦拉州的一只5岁山羊身上被发现，该州与美国得克萨斯州西南部接壤。据美国农业部介绍，美国官员已在该墨西哥州境内追踪到32例这种寄生蝇感染病例，其中19例为活跃感染。
美国农业部称，整体而言，墨西哥境内已确认至少26216例螺旋锥蝇感染病例，仍有超过2700例处于活跃状态。该部门每周两次更新墨西哥境内距美国400英里范围内的新增病例情况，并在专门针对新大陆螺旋锥蝇的网页上明确指出，该害虫“目前未在美国境内出现”，且“当前美国的家畜、其他动物和民众面临的风险仍然极低”。
但在近年近几个月，这种寄生虫的发现地点正越来越靠近美国边境。据得克萨斯州CBS新闻当时报道，今年4月，得克萨斯州农业专员西德·米勒宣布在距美边境60英里的墨西哥境内发现了该寄生虫。得克萨斯州官员自2024年末起就已向户外爱好者发出警告：该州公园与野生动物部门曾发布公告称，墨西哥南部近期在一头牛身上检测到了螺旋锥蝇。
美国卫生与公众服务部当时宣布，去年美国境内确诊了首例人类感染新大陆螺旋锥蝇的病例。该部发言人安德鲁·尼克松在一份声明中对CBS新闻表示，病例是一名从萨尔瓦多返回马里兰州的旅行者。马里兰州卫生官员随后表示，该患者已康复，且调查人员未发现病毒传播给其他人或动物的证据。
据美国疾病控制与预防中心介绍，新大陆螺旋锥蝇是一种寄生蝇，以温血动物和人类为食。它们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。疾控中心称，这种螺旋锥蝇通常分布在南美洲和加勒比海部分地区，但在过去三年中，其在中美洲和墨西哥的发现地点正不断向北延伸。
编辑：梅利莎·加夫尼
美联社与莎拉·林奇·鲍尔温对本文亦有贡献。
Flesh-eating screwworm detected 25 miles from U.S. border, USDA says
June 2, 2026 / 3:34 PM EDT / CBS News
By Emily Mae Czachor News Editor
Emily Mae Czachor is a reporter and news editor at CBSNews.com. She typically covers breaking news, extreme weather and climate. Emily Mae previously wrote for outlets like the Los Angeles Times, BuzzFeed and Newsweek.
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A flesh-eating New World screwworm was recently detected in Mexico just 25 miles from the United States border, according to the U.S. Department of Agriculture. The encounter was the closest to U.S. soil since at least last September, federal data shows.
The screwworm was found in a 5-year-old goat on Thursday in Mexico’s Coahuila state, which shares a border with southwestern Texas. U.S. officials have tracked 32 cases of the parasitic fly throughout the Mexican state, including 19 active cases, according to the USDA.
Overall, at least 26,216 screwworm cases have been identified across Mexico, and upward of 2,700 remain active, the USDA said. The department shares updates twice a week on any new cases found within 400 miles of the U.S. in Mexico, and it prominently notes on a webpage dedicated to the New World screwworm that the pest “is not currently present” stateside and that “the current risk to livestock, other animals, and people in the United States remains very low.”
But in recent months and years, the parasite has shown up closer to the U.S. than ever before. In April, Texas Agriculture Commissioner Sid Miller announced it had been found at a location in Mexico that was 60 miles from the U.S. border, CBS Texas reported at the time. Texas officials have warned outdoor enthusiasts about the parasite since late 2024, when the state’s Parks and Wildlife Department issued an advisory saying the screwworm had recently been detected in a cow in southern Mexico.
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 case was detected in a traveler who had returned to Maryland from El Salvador, HHS spokesperson Andrew Nixon told CBS News in a statement. Maryland health officials later said the person had recovered, and investigators did not find evidence of transmission to other people or animals.
The New World screwworm is a parasitic fly that feeds on warm-blooded animals and people. It lays its eggs in open wounds or orifices like 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 screwworm is typically found in South America and parts of the Caribbean, but it has been detected farther and farther north in Central America and Mexico over the last three years, the CDC said.
Edited by Melissa Gaffney
The Associated Press and Sarah Lynch Baldwin contributed to this report.
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