Texas is racing to contain a flesh-eating parasite that can infect animals and, more rarely, humans, causing horrific wounds that can be fatal if left untreated. The New World screwworm has infected three calves and a goat in Texas. Officials confirmed a fifth case in New Mexico involving a dog that traveled to Mexico on June 8. According to the Centers for Disease Control (CDC), at least seven people have died from screwworm infections in Central America and Mexico as of January 20.