Possible flesh-eating screwworm case in Texas after pest detected 25 miles from U.S. border, USDA says

close up of blowfly on green leaf in sunlight

A possible case of the flesh-eating New World screwworm is being investigated in Texas, the U.S. Department of Agriculture reported Wednesday.  This comes after screwworm was detected last week in Mexico, just 25 miles from the United States border, the USDA previously disclosed. That encounter was the closest to U.S. soil since at least last September, federal data shows. Wednesday’s potential case was found in southern Texas, the USDA said in a social media post, and a sample was sent to the USDA’s National Veterinary Services Laboratories in Ames, lowa, for confirmation. 

“We have already activated personnel on the ground and are working with local partners,” the USDA said. Rep. Don McLaughlin of Texas told Reuters that samples were taken from calves on a cattle ranch in La Pryor, a small southwest Texas community located about 50 miles from the Mexican border.  “If this case is confirmed I will stand lock step with every local, state and federal agency to work together and fight this horror,” McLaughlin wrote on X.  The screwworm detected in Mexico was found in a 5-year-old goat on May 28 in Mexico’s Coahuila state, which shares a border with southwestern Texas. U.S. officials have tracked 32 cases of the parasitic fly throughout the Mexican state, including 19 active cases, according to the USDA.  

Overall, at least 26,216 screwworm cases have been identified across Mexico, and upward of 2,700 remain active, the USDA said. The department shares updates twice a week on any new cases found within 400 miles of the U.S. in Mexico, and it prominently notes on a webpage dedicated to the New World screwworm that the pest “is not currently present” stateside and that “the current risk to livestock, other animals, and people in the United States remains very low.” But in recent months and years, the parasite has shown up closer to the U.S. than ever before.

In April, Texas Agriculture Commissioner Sid Miller announced it had been found at a location in Mexico that was 60 miles from the U.S. border, CBS Texas reported at the time. Texas officials have warned outdoor enthusiasts about the parasite since late 2024, when the state’s Parks and Wildlife Department issued an advisory saying the screwworm had recently been detected in a cow in southern Mexico. Last year, the first case of a New World screwworm infestation in a human was confirmed in the U.S., the Department of Health and Human Services announced at the time. The case was detected in a traveler who had returned to Maryland from El Salvador, HHS spokesperson Andrew Nixon told CBS News in a statement. Maryland health officials later said the person had recovered, and investigators did not find evidence of transmission to other people or animals.

Source: Possible flesh-eating screwworm case in Texas after pest detected 25 miles from U.S. border, USDA says – CBS News

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