The U.S. has blocked imports of live cattle, horses, and bison through southern border ports following the resurgence in Mexico of the New World Screwworm, a parasitic fly that infects animals and threatens humans. New World screwworm flies cause myiasis ...

A flesh-eating maggot that had been eradicated in the U.S. and parts of Central America is back and could potentially threaten Louisiana cattle, experts in the beef industry are warning. Due to the reappearance of New World screwworms in Mexico — a type ...

A rare human case of a deadly parasite infestation has become the latest unsettling pathogen to make headlines in the United States. A New World Screwworm case was confirmed by the Centers for Disease Control and Prevention in a person who had recently ...