Texas Reports New Cases of Screwworm Concern

By Scout Nelson

The Animal and Plant Health Inspection Service (APHIS) has confirmed two new cases of New World Screwworm (NWS) in Texas. One case was found in a calf in La Salle County, while the other was detected in a dog in Andrews County. Officials have started epidemiological investigations to understand how infestations occurred and to prevent further spread. Early information suggests the infected dog had recently traveled from Mexico.

To control the outbreak, authorities have established a 12.4-mile infested zone around each case. Within these zones, strict measures such as quarantines, movement controls, and increased monitoring are being enforced. However, these restrictions will not affect cattle movement or farm operations outside the designated areas.

The United States Department of Agriculture (USDA) has also taken steps to manage the situation by releasing sterile flies in and around the affected areas. This method helps control the screwworm population by reducing reproduction. To support this process, a sterile fly dispersal facility at Moore Air Base in Edinburg, Texas, has been activated. Sterile pupae have already arrived, and aerial release operations are scheduled to begin shortly.

During surveillance efforts, sterile flies may be found in traps. To ensure accurate identification, USDA uses special dyes on the sterile pupae. These dyes appear as fluorescent green or orange and can be seen under ultraviolet light or even with the naked eye. This helps officials quickly determine that the captured flies are not a threat.

The New World Screwworm is a harmful parasite that affects livestock and other warm-blooded animals. It typically enters the body through open wounds and feeds on living tissue, causing serious damage. Because of this, producers are encouraged to carefully check their animals for signs of infection. Prompt action is important if symptoms are noticed.

If an infestation is suspected, experts recommend contacting a local veterinarian immediately. Continued monitoring, preventive action, and cooperation with authorities will play a key role in controlling the spread and protecting animal health across the region.

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