San Diego County public health officials are urging residents to watch for signs of New World screwworm in people and animals after recent animal cases were confirmed in Texas and New Mexico, according to East County Magazine and the County of San Diego Communications Office.

No cases have been detected in California or San Diego County, and county officials described the current local risk as low. The parasite, which was eradicated in the United States in 1966, is a fly whose larvae can feed on living tissue after eggs are laid on open wounds.

County officials advised animal owners to routinely check pets, livestock and wildlife for wounds or unusual behavior, including headshaking or irritation. Animals with open wounds or signs of infestation should be taken to a veterinarian immediately.

People with open sores, recent surgical wounds, weakened immune systems or limited ability to notice or care for wounds may face higher risk in areas where the pest is present. Officials also pointed to people who sleep outdoors and those who live or work near livestock or other warm-blooded animals as groups that should be alert.

For Santee residents with dogs, backyard animals or trips planned to regions where the pest is present, the practical advice is straightforward: keep wounds clean and covered, use insect repellent when appropriate, and seek medical or veterinary care if a wound becomes painful, drains, smells unusual or shows signs of larvae.

Source: East County Magazine published the county guidance on July 26, 2026, citing the County of San Diego Communications Office.