德克萨斯州普雷西迪奥县一匹牧场马匹被确诊感染新世界蝴蛆，这是美国历史上首次在马类身上发现该寄生虫1。这一发现标志着该疫情的范围进一步扩大，已从最初的单一物种感染发展至多个动物种类。
新世界蝴蛆于6月首次在美国现身，当时在扎瓦拉县发现了一头感染的牛犊1。截至报告时，德克萨斯州和新墨西哥州共报告了49起感染案例，其中48起在德州，1起在新墨西哥州1。为应对疫情扩散，德州动物卫生委员会已对普雷西迪奥县和杰夫戴维斯县等地实施温血动物流动限制措施1。同时，特朗普政府已在埃丁堡建立无菌蝇释放设施，以帮助遏制这种寄生虫的传播1。德州州长格雷格·阿博特在6月发布了灾难公告1。
A ranch horse in Presidio County, Texas, has tested positive for New World screwworm, marking the first documented infection of the parasitic fly in an equine in the United States 1. The infected horse's hind legs were affected by the infestation 1.
The discovery adds to a growing outbreak that began in June when the parasite was first detected on a cattle calf in Zavala County 1. As of the latest reports, the United States has recorded 49 infections in 2024—48 in Texas and 1 in New Mexico 1. In response to the threat, the Texas Animal Health Commission has imposed movement restrictions on warm-blooded animals in Presidio County and Jeff Davis County, among other affected areas 1. Governor Greg Abbott declared a disaster in June as the outbreak escalated 1.
Federal authorities have mobilized containment efforts, including the establishment of a sterile fly release facility in Edinburgh announced by the Trump administration to help control the spread of the infestation 1.
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