US recloses border after flesh-eating parasite seen in Mexico


By JOHN HANNA, Associated Press

The U.S. has closed its southern border again to livestock imports, saying a flesh-eating parasite has moved further north in Mexico than previously reported.

Mexico’s president was critical Thursday, suggesting that the U.S. is exaggerating the threat to its beef industry from the parasite, the New World screwworm fly. The female flies lay eggs in wounds on warm-blooded animals, hatching larvae that are unusual among flies for feeding on live flesh and fluids instead of dead material.

American officials worry that if the fly reaches Texas, its flesh-eating maggots could cause large economic losses, something that happened decades ago. The U.S. largely eradicated the pest in the 1970s by breeding and releasing sterile male flies to breed with wild females, and the fly had been contained in Panama for years until it was discovered in southern Mexico late last year.

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An adult New World screwworm fly sits at rest in this undated photo. (Denise Bonilla/U.S. Department of Agriculture via AP)

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The U.S. closed its southern border in May to imports of live cattle, horses and bison but announced June 30 that it would allow three ports of entry to reopen this month and another two by Sept. 15. However, since then, an infestation from the fly has been reported 185 miles northeast of Mexico City, about 160 miles further north than previously reported cases. That was about 370 miles from the Texas border.

“The United States has promised to be vigilant,” U.S. Department of Agriculture Secretary Brooke Rollins said in a statement Wednesday announcing the border closing. “Thanks to the aggressive monitoring by USDA staff in the U.S. and in Mexico, we have been able to take quick and decisive action to respond to the spread of this deadly pest.”



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