State officials establish a 12.4-mile surveillance zone near Piñon as animal owners are urged to watch for signs of infestation

Organ Mountain News report

PIÑON, N.M. - New Mexico animal health officials confirmed a case of New World screwworm in a beef cow in Otero County on Wednesday, Oct. 21, prompting expanded surveillance and restrictions on livestock movement around the affected location.

The New Mexico Livestock Board and federal partners are increasing inspections and fly-trapping in the area to identify additional infestations and determine whether the parasitic pest has spread to other animals.

Officials have established an infested zone extending at least 12.4 miles from the location of the affected cow. Animals within the zone must be inspected and, if necessary, treated before they can be moved within or outside the designated area.

“We are working closely with our state and federal partners to investigate these cases, increase surveillance and monitor for additional infestations,” said Dr. Samantha Holeck, New Mexico's state veterinarian.

The confirmation follows earlier detections of New World screwworm in New Mexico, including cases involving horses and cattle in Grant County.

What animal owners should watch for

New World screwworm is a parasitic fly whose larvae infest wounds and feed on living tissue. Untreated infestations can cause severe injury and may be fatal to affected animals.

Although livestock are particularly vulnerable, the pest can also affect wildlife, pets and, in rare cases, humans.

State officials are urging animal owners to inspect their animals closely, particularly around wounds and injuries.

Warning signs include:

• Wounds that do not heal
• Injuries that worsen unexpectedly
• Maggots visible in wounds
• Foul-smelling discharge
• Unusual irritation around an injury

Anyone who suspects a New World screwworm infestation should immediately contact the New Mexico Livestock Board and avoid moving the affected animal.

The Livestock Board can be reached at 505-841-6161.

Cooler weather does not eliminate risk

New Mexico Secretary of Agriculture Jeff Witte warned that falling temperatures may reduce screwworm activity but will not necessarily stop infestations.

“This is a critical time as we move toward cooler weather. Cold daytime temperatures can slow screwworm activity, but the risk is not completely eliminated,” Witte said.

“Strong surveillance and continued coordination with our state and federal partners will help us detect new cases early and limit impacts through the fall and into next spring. We encourage livestock producers and animal owners to remain vigilant, monitor their animals closely and promptly report any suspected cases.”

State and federal investigators are continuing to monitor affected areas as they work to identify additional infestations and limit the pest's spread.

Animal owners can find current maps of affected areas, movement requirements, identification guidance and reporting resources at ScrewwormNM.org.