A New World Screwworm infection identified in New Mexico is raising concerns across South Texas. Animal advocates are urging San Antonio residents to inspect pets for wounds, keep animals indoors when possible and report suspected infestations immediately.
AT A GLANCE
- A dog infected with New World Screwworm was recently identified in New Mexico.
- The parasite’s larvae feed on living tissue and can cause severe injury.
- Outdoor pets, stray animals and livestock face the greatest risk.
- Pet owners should inspect animals daily for wounds or signs of infection.
- Suspected cases should be reported immediately to local authorities and animal health officials.
What Every San Antonio Pet Owner Should Know About New World Screwworm
Animal welfare advocates are urging South Texas residents to closely monitor pets and outdoor animals following the detection of a dog infected with New World Screwworm (NWS) in New Mexico.
The alert was issued by the World Animal Awareness Society (WA2S), which warned that the flesh-eating parasite could pose a growing threat to pets, livestock, wildlife and stray animal populations if additional cases emerge in the region.
New World Screwworm, scientifically known as Cochliomyia hominivorax, is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals. Female flies lay eggs in open wounds, cuts, scratches or other skin openings. Once hatched, the larvae burrow into living tissue, causing severe injury that can become life-threatening if left untreated.
The parasite was eradicated from the United States decades ago through an intensive federal eradication program, but recent detections in Mexico and the Southwest have renewed concerns among animal health officials.
Animal advocates say San Antonio’s large population of stray and free-roaming dogs and cats could make the region particularly vulnerable because many animals are not regularly monitored for wounds or signs of illness.
What Pet Owners Should Watch For
Residents are encouraged to inspect pets daily, especially animals that spend time outdoors. Warning signs may include:
- Open or slow-healing wounds
- Excessive scratching or licking
- Foul-smelling sores
- Visible larvae or maggots in a wound
- Sudden lethargy or unusual behavior
Veterinarians recommend seeking immediate medical attention if an infestation is suspected.
Outdoor Pets Face Greater Risk
Experts say animals that remain outdoors for extended periods face a higher risk because even minor injuries can attract screwworm flies. Pet owners are encouraged to bring animals indoors whenever possible, treat wounds promptly and consult a veterinarian regarding approved wound-care and fly-repellent products.
Human Health Concerns
While New World Screwworm primarily affects animals, health officials note that humans can also become infested in rare cases when flies deposit eggs in open wounds.
Individuals who work outdoors, handle animals or have untreated wounds are encouraged to exercise caution and seek medical attention if unusual symptoms develop.
Reporting Suspected Cases
Residents who encounter an animal with a severe wound containing visible larvae are encouraged not to handle the animal without proper protection.
Suspected cases in San Antonio should be reported through the City’s 311 system or to local animal welfare authorities. Cases involving livestock or other agricultural animals should also be reported to the Texas Animal Health Commission.
Animal welfare organizations are urging residents to remain vigilant as state and federal officials continue monitoring for additional detections.
