US suspends Mexican cattle imports after New World screwworm case

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Published: November 25, 2024

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Mexico | Reuters — The United States has temporarily paused imports of Mexican cattle after a case of New World screwworm (NWS) was identified at the lakeside town of Catazaja in southern Chiapas state, the Mexican government said on Sunday.

“The United States and Mexico are working on implementing measures to resume the normal flow of Mexican exports,” it said in a statement.

It added that the measures did not apply to other exports and control measures were being implemented.

The U.S. Department of Agriculture (USDA) on Friday said that Mexico’s chief veterinary officer had notified it of the detection of NWS in a cow at a checkpoint near the southern border with Guatemala.

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Carlos Mahr, cattle producer and President of the Chiapas Livestock Union Spray disinfectant on one of his cows as the Mexican government and ranchers struggle to control the spread of the flesh-eating screwworm, in Tuxtla Gutierrez, Chiapas state, Mexico July 3, 2025. Photo: REUTERS/Daniel Becerril

Mexico reports 53 per cent increase in flesh-eating screwworm cases since July

Mexico has recorded 5,086 cases of flesh-eating screwworm in animals as of August 17, a 53 per cent jump from the number of cases reported in July, according to Mexican government data seen by Reuters on Wednesday.

NWS maggots often enter through an open wound and feed on living flesh of warm-blooded animals, including people, USDA said.

It warned that infestations can be difficult to detect at first but can manifest itself through growing wounds, creamy larvae and signs of discomfort.

USDA said it was working with partners in Mexico and Central America to stop the screwworm’s spread and asking producers in the area to monitor their livestock and pets, and immediately report potential cases.

— Reporting by Sarah Morland

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