跟进：新墨西哥州 Otero County 一头肉牛确诊新世界螺旋蝇：事发地周边划设至少20公里感染区

位于美国西南部的新墨西哥州农业部（New Mexico Department of Agriculture）10 月 21 日表示，该州动物卫生官员已经确认，Otero County 一头肉牛感染新世界螺旋蝇（New World screwworm）。这是同一天内美国官方确认的又一起新病例：美国农业部（USDA）当天早些时候刚宣布，美国首次在野生动物体内检出这种寄生虫，感染个体是德克萨斯州 Pecos County 一处狩猎牧场的一头麋鹿。

据路透社报道，新墨西哥州农业部表示，州与联邦官员正持续扩大事发地点周边的监测与诱蝇布设，以查找更多病例，并判断这种害虫是否已经扩散到涉事动物之外。州农业部已在涉事肉牛所在地周边划设半径至少 12.4 英里（约 20 公里）的感染区；区内动物在区内移动或运出该区域之前，必须先接受检查，必要时接受治疗。

德克萨斯州方面，州动物卫生委员会将调整此前划定的一个感染区范围，美国农业部与德克萨斯州公园和野生动物厅正在当地加强野生动物监测。

新世界螺旋蝇是一种寄生性蝇类，其幼虫以温血动物的活体组织为食，对畜牧业与野生动物构成威胁。这种害虫数十年前已在美国境内被根除，近年自中美洲经墨西哥向北扩散。美国曾为防堵其入境暂停墨西哥活牛进口一年多，今年 8 月才经亚利桑那州一个口岸、按分阶段重启计划恢复贸易；进口暂停一度收紧美国牛肉供应，牛肉价格升至历史高位。

关联：跟进：德州 Pecos County 一头麋鹿检出新世界螺旋蝇 为美国野生动物首例

Follow-Up: New World Screwworm Confirmed in a Beef Cow in Otero County, New Mexico; Infested Zone of at Least 20 km Set Around the Site

The New Mexico Department of Agriculture said on October 21 that state animal health officials have confirmed a case of New World screwworm in a beef cow in Otero County, New Mexico, in the southwestern United States. It was another new U.S. case confirmed the same day: the U.S. Department of Agriculture (USDA) had announced earlier that day the first detection of the parasite in U.S. wildlife, in an elk on a game ranch in Pecos County, Texas.

According to Reuters, the New Mexico Department of Agriculture said state and federal officials were continuing to expand surveillance and fly trapping around the affected locations to identify any additional cases and determine whether the pest had spread beyond the affected animals. Officials have established a minimum 12.4-mile (20 km) radius infested zone around the affected animal's location, and within the zone animals must be inspected and, if necessary, treated before moving within or out of the area.

In Texas, the Texas Animal Health Commission will modify a previously established infested zone, and the USDA and the Texas Parks and Wildlife Department are conducting additional wildlife surveillance in the area.

The New World screwworm is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals, threatening livestock and wildlife. Eradicated from the United States decades ago, the pest has surged north from Central America through Mexico. The United States halted livestock imports from Mexico for more than a year to keep it out, resuming trade in August at an Arizona port under a phased reopening plan; the halt tightened U.S. cattle supplies and pushed beef prices to record highs.

来源：GSM·美国（原文链接）

图片来源：牧场上的肉牛（资料图）。照片：Mahfuzur Rahman Nafi 摄，CC0，经 WordPress Photo Directory。 / Beef cattle on pasture (file photo). Photo: Mahfuzur Rahman Nafi, CC0, via WordPress Photo Directory

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