What You Need to Know
• Two cases of New World screwworm in dogs are confirmed in Texas and New Mexico.
• The New World screwworm parasite reappeared in the U.S. in June after over 50 years of eradication.
• The American Veterinary Medical Association warns that newborn animals and those with wounds are especially vulnerable.
Veterinarians and humane societies are urging pet owners to be vigilant after two cases of New World screwworm in dogs were confirmed in Texas and New Mexico. The parasite, which is the larvae of the New World screwworm fly, reemerged in cattle in the U.S. in June 2023, more than five decades after it was largely eradicated. The larvae feed on live flesh and fluids, posing a significant threat to various mammals, including pets and livestock. Animal health experts recommend that pet owners in affected areas, particularly southern and southwestern Texas and southeastern New Mexico, regularly inspect their animals for wounds, cuts, or bites, as these can attract the screwworm. Signs of infestation include maggots in wounds, foul odors, and unusual behavior in pets.
Why It Matters
The resurgence of the New World screwworm is significant for both animal health and agriculture, particularly affecting the $113 billion U.S. cattle industry. The parasite’s larvae can infest any mammal, making it a widespread concern. The American Veterinary Medical Association emphasizes that animals with open wounds or recent surgeries are particularly at risk. As the screwworm migrates north from Panama in 2024 and through Mexico in 2025, monitoring and preventive measures will be crucial to mitigate its impact on domestic animals and livestock.
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