First New World Screwworm Case in U.S. Cattle in 60 Years Detected in Texas
A flesh-eating New World screwworm was just found in a Texas cow—here’s what to know

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The U.S. Department of Agriculture has confirmed the first case of the New World screwworm in cattle in the U.S. since 1966, found in a calf in Zavala County, Texas. This parasitic pest poses a significant threat to livestock, prompting immediate containment measures by authorities.
- 01The New World screwworm was eliminated in the U.S. in 1966 but has re-emerged in Texas.
- 02The infection was found in a three-week-old calf's umbilical area in Zavala County.
- 03USDA is implementing a 20-kilometer quarantine zone and releasing sterile flies to control the outbreak.
- 04Infections can cause severe wounds and are primarily a threat to livestock, though they can infect humans in endemic areas.
- 05Residents are advised to monitor their animals for signs of infection and seek medical attention if they suspect human infection.
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The U.S. Department of Agriculture (USDA) has confirmed the first case of the New World screwworm in a cow in the United States in approximately 60 years, marking a significant agricultural concern. Detected in a three-week-old calf in Zavala County, Texas, this case represents the first instance since the pest was eradicated in the U.S. in 1966. New World screwworms are parasitic flies that lay eggs in open wounds, leading to painful infections. The USDA has initiated immediate containment measures, including establishing a 20-kilometer quarantine zone around the infection site and releasing sterile flies to curb further spread. Experts had anticipated the pest's return due to its northward migration from Central America, where it causes substantial economic losses. While infections in humans are rare, those with open wounds in endemic areas are at risk. The CDC recommends keeping wounds clean and covered, and seeking medical help if infection is suspected.
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The detection of the New World screwworm in Texas poses a serious threat to local livestock, potentially affecting farmers and the agricultural economy.
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