What to know about protecting pets from the New World screwworm fly
Summary
The New World screwworm fly, a parasite that eats live flesh, has reappeared in parts of Texas and New Mexico after being gone for over 50 years in the U.S. Veterinarians and animal groups warn pet owners to watch for signs of infestation and protect their animals using flea and tick medicines. The parasite can infect many mammals, including pets, and cause serious harm or death if not treated.Key Facts
- The New World screwworm fly larvae eat live flesh, unlike most fly larvae that eat dead material.
- The parasite was first found again in U.S. cattle in June after more than 50 years of eradication.
- It has spread north from Panama since 2024, moving through Mexico in 2025, reaching Texas and New Mexico.
- The fly lays eggs in open wounds or mucous on mammals; larvae hatch and feed for about a week before becoming adult flies.
- Any mammal can be affected including cattle, dogs, cats, wildlife, and sometimes humans.
- Signs of infestation include restlessness, bad smell, animals focusing on a wound, and visible maggots.
- Newborn animals and those with recent wounds or surgeries are most at risk; even tick bites can lead to infestation.
- Flea and tick medications prescribed by veterinarians can help prevent infestations in pets.
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