New World screwworm detected roughly 70 miles from the Texas border as USDA efforts intensify

New World screwworm was found roughly 70 
miles from Laredo, Texas. (USDA photo)

 

The New World screwworm and its flesh-eating larvae have made their way through Mexico to hover fewer than 70 miles from the U.S.-Mexico border. "The case was reported near Sabinas Hidalgo in Nuevo Leon," reports Joshua Baethge of Farm Progress. "That city is close to a major highway connecting Monterrey, Mexico’s second-largest metro area, and Laredo, Texas."

Screwworm larvae were discovered in "an 8-month-old cow that was moved to the area from southern Mexico, which has active NWS cases," Baethge writes. Concerned lawmakers and livestock owners would like Agriculture Secretary Brooke Rollins to persuade the Mexican government to restrict cattle movement to contain the pest.

While NWS larvae will eat the flesh of any warm-blooded animal, female screwworm flies most often lay their eggs in the open wounds or scratches of sheep or cattle. The larvae are considered a threat to U.S. livestock and rancher economies as well as the U.S. food supply.

Rollins said "protecting the U.S. from New World screwworm is a 'national security priority," Baethge reports. Rollins added that "U.S. farmers and ranchers should know that the U.S. 'will not rely on Mexico' to defend the cattle industry, the food industry or 'our way of life.'"

State of Nuevo León within Mexico
(Wikipedia map)

The USDA and Mexican authorities have been working together to push the NWS away from both countries' livestock herds through sterile fly releases, animal surveillance and fly trapping and testing work. 

Since July, the USDA and Mexico "have been monitoring almost 8,000 traps across Texas, Arizona, and New Mexico," reports Jennifer Carrico of Progressive Farmer. "Currently, all the 13,000-plus screening samples have detected no NWS flies."

While the latest detection in Nuevo Leon, Mexico, appears to be limited to one cow, the USDA is still investigating. "Rollins said the U.S will be 'taking no chances,'" Baethge reports.