Parasitic New World screwworm prompts quarantine order, warnings from Pennsylvania agricultural officials

Nearly two weeks after it was first detected on a calf in South Texas, the New World screwworm infestation has spread to more than a dozen animals, including a dog in New Mexico. Officials now fear the devastating pest is moving to other parts of the country. KYW Newsradio's John McDevitt reports Pennsylvania is among the states taking preventive measures. (Photo: Getty Images)