Dangerous Pest Returns to U.S. After 60 Years — Here's the Plan

A parasitic fly that hasn't infected U.S. livestock since 1966 has resurfaced in Texas cattle. The USDA is ready. Four months before the outbreak, a facility in Edinburg began producing sterile male flies designed to mate with wild ones, preventing reproduction. Officials are now using these engineered flies and strict containment rules to stop the pest from spreading.