Flesh-eating screwworm spreads to Arizona, attacking US pets

The New World screwworm infestation has spread to Arizona, joining Texas and New Mexico, with 74 animal cases confirmed in the US since June. The fly's larvae bore into wounds in living flesh. This week the USDA recorded four new cases in dogs and one in a cat, taking pet cases to 10. Mexico has confirmed 806 human cases and nine deaths.