USDA Confirms Flesh-Eating New World Screwworm in Texas Calf

The U.S. Department of Agriculture (USDA) has confirmed the detection of a New World screwworm (NWS) in a calf in Texas, prompting emergency containment measures to prevent the parasite from spreading.

The New World screwworm is a parasitic fly whose larvae feed on living tissue, posing serious risks to livestock, pets, and wildlife if left unchecked.

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According to the USDA, the only confirmed case involves a three-week-old calf in Zavala County, Texas, where larvae were discovered in the animal’s umbilical area.

Federal and state authorities have launched an immediate response, including the creation of a 12-mile quarantine and surveillance zone, expanded trapping efforts along the southern border, and the formation of a joint incident command team with the Texas Animal Health Commission.

The New World screwworm is a parasitic fly whose larvae feed on living tissue, posing serious risks to livestock, pets, and wildlife if left unchecked.

USDA officials stressed that the United States has successfully eradicated the pest before and remains equipped to contain future outbreaks. Authorities also emphasized that the risk to humans remains low, though residents and livestock owners are being urged to remain vigilant.