The New World screwworm fly is threatening the $113 billion U.S. cattle industry for the first time in more than a half century, with an infestation from its flesh-eating larvae confirmed in south Texas.

Agriculture Secretary Brooke Rollins said there have been no other detections of the fly in the U.S., and officials were quick to say that while the fly's larvae are a threat to livestock production, they don't infest food.