A potentially deadly parasitic infection, New World screwworm, has been detected in the US Southwest after being absent for decades. The parasite, which feeds on living flesh, poses a significant threat to pets, particularly dogs, and can be fatal if left untreated. The last US outbreak occurred in the 1970s, after which eradication programs were successful. Recent cases have been confirmed in Texas and neighboring states, prompting concern among veterinarians and pet owners. Symptoms include open wounds that don’t heal and the presence of larvae. Officials are working to contain the spread and are urging pet owners to take preventative measures and seek immediate veterinary care for any suspicious wounds. The re-emergence is believed to be linked to increased travel of animals across the border from Mexico, where the parasite remains endemic.