More cases of he New World Screwworm have been added to the Screwworm.Gov website– the latest cases are all sheep in south Texas just north of the US-Mexican border. Four of the cases reported were found in Crockett County (County seat is Ozona) while one case reported was in Edwards County (County seat is Rocksprings).
There are now 22 active cases and three inactive cases of New World Screwworm that have been found in the US since June third. All have been in Texas with the exception of the dog that was reported in New Mexico.
New World screwworm is a parasitic fly that causes severe, potentially fatal infestations by feeding on the living tissue of warmblooded animals. Quick detection, treatment, and reporting are vital to safeguarding livestock, wildlife, and pets.
USDA and TAHC are conducting a coordinated response that includes:
- Joint epidemiological investigations and case tracing
- Additional surveillance, testing, and trapping in the affected areas
- Releasing sterile insects and adjusting these operations as needed for the most effective coverage
- Conducting outreach to animal owners
- Ongoing coordination with local officials, veterinarians, ranchers, and community partners
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According to the latest statistics provided by Mexico- there are currently 244 active cases of New World Screwworm in the three Mexican states adjacent to the US- Mexican border- Coahuila, Nuevo Leon and Tamulipas. The green on the map above shows where sterile flies are being dispersed on both sides of the US-Mexican border.
Guidance for Animal Owners and Veterinarians
The MOST important thing animal owners can do is to know what to look for and how to report suspected cases of NWS. USDA urges everyone in the area to check animals for:
- Draining or enlarging wounds
- Maggots or egg masses
- Signs of discomfort
- Lesions in body openings (nose, ears, genitalia, umbilical area)
Anyone who suspects a screwworm infestation should immediately contact their veterinarian, state animal health official, or USDA. Early reporting is essential to ensure animals receive prompt treatment, so they fully recover.
Though rare in people, anyone who notices a suspicious lesion should seek immediate medical care.
Food Safety
The U.S. food supply remains safe. NWS does not infest meat, fruits, vegetables, or other food products. Any affected animal would be identified during USDA Food Safety and Inspection Service inspection, and no contaminated product would enter commerce.
Additional updates and resources are available at Screwworm.gov
