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US again stops cattle imports from Mexico due to flesh-eating screwsworms

The U.S. Department of Agriculture reported that the New World Screwworm, a livestock pest that eats flesh, has moved closer to the U.S.-Mexico border. Washington blocked imports of Mexican calves just days after allowing them to resume at an Arizona port of entry. Screwworms are parasitic fly larvae that lay their eggs in the wounds of warm-blooded mammals, such as livestock and wild animals. The larvae of the screwworm burrow into living flesh with their sharp teeth once they hatch. If left untreated, these larvae can kill their hosts. The USDA announced late Wednesday that Mexico reported a case of screwworm on Tuesday in Ixhuatlan de Madero in Veracruz. This is about 370 miles from the U.S. Border. The USDA ordered that all livestock trade be stopped through southern ports of entrance, effective immediately.

Bill Bullard is the CEO of R-CALF USA, a group of cattle producers in the United States. He said that closing down border was not only justified but essential. Mexican President Claudia Sheinbaum criticized the decision as "exaggerated" and said it was motivated by one new case.

Sheinbaum told her morning press conference Thursday that "it is an overreaction to a situation which is already under control."

Mexico recorded 480 cases at its peak, in late June. According to the most recent data from the Agriculture Ministry this number has fallen below 400, as Mexico continues its campaign against the pest.

Sheinbaum said, "We hope they will be reopening very soon."

United States

Concerns expressed by the Mexican government about the threat of the disease nearing its northern border. A US infestation could cause further shortages of cattle in the United States, already at their lowest level in decades. It would also threaten other livestock, including household pets. In May, the USDA suspended Mexican beef imports after screwworm was found on farms in Oaxaca or Veracruz in Mexico. The agency announced last week that imports would resume on Monday in Douglas, Arizona as part of a gradual reopening the border, because screwworms were not moving north from Mexico.

Secretary Brooke Rollins stated that the USDA must see progress in fighting the pest in Veracruz, and other nearby Mexican states, before it will reopen the livestock ports along the southern border.

In the 1960s, researchers introduced sterile male screwworm flies to mate with female screwworms in order to produce infertile egg. Last month, the USDA announced that it was building a sterile flies dispersal facility and considering a sterile flies production facility in Hidalgo county, Texas.

Colin Woodall, CEO for the National Cattlemen's Beef Association, said that work should begin immediately on a U.S. facility to produce sterile flies.

He said that the New World Screwworm's movement northwards jeopardizes American agriculture. "We can't wait any longer."

In a press release, the Mexican Beef Producers Association expressed regret for the suspension of the program. Meanwhile, the Mexican government indicated that they were working to release sterile fly. Reporting by Tom Polansek, Aida Pelaez Fernandez and Mark Porter; editing by Chizu Nomiyama & Mark Porter

(source: Reuters)