screwworm

(Newser) - The US has fought to keep the New World screwworm, a parasitic fly whose larvae "eat animals alive," out of North America since the 1950s—and has been wildly successful. That success is now in jeopardy. As Sarah Zhang reports for the Atlantic , the USDA's effective...

(Newser) - The US has halted all imports of live cattle, horses, and bison from Mexico—and officials say the move isn't connected to tariffs. Authorities say they are trying to prevent the spread of the New World screwworm fly, a parasite the US eliminated almost 60 years ago, USA Today...