新的世界螺丝虫回到墨西哥,威胁美国的牛群;美国农业部考虑绝育控制。 New World screwworms, back in Mexico, threaten U.S. cattle; USDA considers sterilization control.

新的世界螺丝虫在1960年代被消灭后, 正在墨西哥和中美洲重新出现, 威胁着美国牧牛人。 New World screwworms, once eradicated in the 1960s, are resurfacing in Mexico and Central America, threatening U.S. cattle ranchers. 这些昆虫在动物伤口中产卵,引起疾病和死亡。 These insects lay eggs in animal wounds, causing illness and death. 美国农业部禁止墨西哥牛进口,支持生产绝育的雄性螺旋虫,以控制其人口。 The USDA has banned Mexican cattle imports and supports producing sterilized male screwworms to control their population. 一项法案提议为此目的建造一个美国设施,这对于防止对牛业造成经济损害至关重要。 A bill proposes building a U.S. facility for this purpose, critical for preventing economic damage to the cattle industry.