New Mexico animal health officials announced Friday that a second case of New World screwworm (NWS) has been confirmed in the state. The parasite was identified in a horse located in Grant County, west of Deming.

Expanded surveillance and containment measures

In response, state and federal agencies have broadened fly‑trapping and surveillance efforts around the affected area to locate any additional infestations and to assess whether the pest has spread beyond the initial horse.

The New Mexico Department of Agriculture (NMDA) has established a 12.4‑mile radius around the horse’s location as a containment zone. Within this zone, all animals must be inspected, and if necessary, treated before they are moved to another location. An additional surveillance zone will support ongoing monitoring and early detection of any new cases.

Guidance for producers

NMDA officials advise producers to watch for suspicious wounds on livestock and to keep open wounds clean and covered. Anyone who observes a wound that may be infected with NWS should immediately contact the New Mexico Livestock Board and refrain from moving the animal.

Infested animals should receive treatment under the direction of a veterinarian. Prompt reporting and proper handling are essential to prevent further spread of the parasite.

National context

According to the U.S. Department of Agriculture, there are currently 50 recorded animal cases of New World screwworm nationwide. Three of those cases remain active, including the horse in Grant County. The other two active cases involve a horse and a dog in Texas.

Authorities continue to monitor the situation closely, emphasizing that early detection and rapid response are critical to protecting the state’s livestock industry.

Original reporting: El Paso News (HLL/CB) — read the source article.