New World Screwworm Returns to the U.S.; Sterile-Fly Program Ramps Up

The New World screwworm fly has reappeared in the United States, signaling a potential northward spread that could threaten livestock. In response, authorities are expanding a sterile-fly program, including a facility in Edinburg, Texas, where dyed fly pupae are used to rear and release sterile males to curb the population.