Media Experts on New World Screwworm (opens in new tab)

The U.S Department of Agriculture has confirmed a case of New World screwworm in Zavala County, Texas in a three-week old calf. New World screwworm is a serious parasitic fly that can affect livestock, pets, wildlife, and less commonly, people and birds. Adult screwworm flies are about the size of a common housefly or slightly larger. Their larvae feed on the living tissue of warm-blooded animals.