Beware the “Maneater” Parasite: A Warning for Texas Pet Owners

Texas officials are sounding the alarm about the New World Screwworm, a parasitic fly known for its devastating effects on animals—and in rare cases, humans. Recently found in a cow in southern Mexico, this dangerous pest has been steadily migrating north, prompting the Texas Parks and Wildlife Department to issue a stern advisory for outdoor enthusiasts and those who work with animals.

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What Makes the Screwworm So Dangerous?

The New World Screwworm, scientifically named Cochliomyia hominivorax, earns its nickname “maneater” for good reason. This parasite's larvae, or maggots, burrow into open wounds, nostrils, eyes, and even mouths, feeding on the flesh of living animals. A single female fly can lay up to 300 eggs at a time, and her lifetime total can reach a staggering 3,000. Once the eggs hatch, the maggots embed themselves, causing painful injuries, severe infections, and potentially death if left untreated.

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How to Identify and Prevent Infestation

Signs of infestation, known as New World Screwworm Myiasis, include:

• Unusual or irritated behavior in animals.
• Loss of appetite or isolation from other animals.
• Head shaking or scratching at wounds.
• The smell of decaying flesh and visible maggots.

To prevent this horrifying scenario, Texas officials recommend cleaning and covering all wounds when spending time outdoors, particularly in southern border regions. Applying insect repellant to clothing and exposed skin can also help deter these flies.

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A Threat on the Move

Though the screwworm was eradicated in the U.S. in the 1960s through innovative pest control measures, the parasite has remained endemic in parts of Central and South America. With cases now appearing as far north as Mexico, the USDA warns of the risk of reintroduction into the U.S. This risk underscores the importance of vigilance, especially among hunters, livestock owners, and pet owners in Texas.

Stay cautious and proactive—this "maneater" parasite is not a threat to be taken lightly. If you suspect an infestation in wildlife, livestock, or pets, report it immediately to animal health officials.