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USDA Confirms First Case of New World Screwworm in Lea County, New Mexico, Fourth Case in Texas

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Additional details about the epidemiological investigation into the case that was reported earlier today in Andrews County, Texas. While the veterinarian who reported the case is located in Texas, the dog resides at a household in Lea County, New Mexico. Therefore, the location of the case will be reclassified to be the first case detected in New Mexico.

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NRCS New Mexico ready to provide assistance to producers with the New World Screwworm (PDF)

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“NRCS New Mexico will work closely with both producers and other government agencies to give a unified and diligent response to this concerning development. NRCS continues to be committed to New Mexico agriculture producers,” said NRCS State Conservationist J. Xavier Montoya.

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USDA Confirms Presence of New World Screwworm in the United States

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The U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the detection of a New World screwworm (NWS) in a bovine in Zavala County, Texas. NWS is a serious pest that affects livestock, pets, wildlife, and less commonly, people and birds.

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USDA APHIS map showing New World Screwworm case status in Mexico through March 25, 2026. Total cases: 18,536. Active cases: 1,323. Highest concentrations in Chiapas, Oaxaca, Veracruz, and Yucatán. The state closest to the U.S. border with active cases is Tamaulipas.

New Mexico officials worry about New World screwworm spreading into state

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New Mexico state and federal officials this week expressed concern about the encroachment of a parasitic fly into the state, even as federal officials in March unveiled a flurry of efforts to combat the insect's spread.

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NMSU experts team up to keep NM alert on New World screwworm

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New Mexico state and federal officials this week expressed concern about the encroachment of a parasitic fly into the state, even as federal officials in March unveiled a flurry of efforts to combat the insect's spread.

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