New World Screwworm Case Found in Otero County Cow

New Mexico health authorities confirmed a case of New World screwworm in a cow in Otero County. The parasite lays eggs in open wounds, and larvae feed on the animal's living tissue.

A quarantine zone of at least 12.4 miles surrounds the point where the affected animal was found. Cattle and domestic animals inside that perimeter must be inspected and, if needed, treated before officials approve movement into or out of the area.

State and federal agencies increased surveillance and set fly traps in the area to look for additional outbreaks. The New Mexico Livestock Board and federal partners are working together on the investigation.

State veterinarian Dr. Samantha Holeck of the New Mexico Livestock Board said the agencies are working closely to investigate cases, increase surveillance, and monitor for additional infestations.

Agriculture Secretary Jeff Witte said the change of season matters. He said colder temperatures can slow the parasite's activity, but the risk remains. He urged producers and ranchers to report any unusual condition in their animals right away.

Officials point to three signs to watch for: open wounds that do not heal or worsen quickly, visible larvae or maggots in a wound, and foul-smelling discharge or severe irritation around an injury. Owners who suspect screwworm should not move the animal and should notify the New Mexico Livestock Board. Maps of the restricted area and reporting resources are posted at ScrewwormNM.org.