Mexico hopes to quickly resolve New World Screwworm case halting cattle exports into US

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Published: November 28, 2024

File photo of a cowboy herding cattle near a Mexican roadside. (GummyBone/iStock/Getty Images)

Mexico City | Reuters — Mexican President Claudia Sheinbaum said that Mexican and U.S. officials were in contact over a case of New World screwworm (NWS) detected late last week that caused the U.S. to halt imports of Mexican cattle.

“We hope it will be resolved this week,” Sheinbaum said in a morning press conference, saying officials from U.S. Department of Agriculture were in permanent contact with Mexico’s Agriculture Minister Julio Berdegue.

Sheinbaum said controls were in place to prevent the contamination of livestock coming mainly from the southern border. “When cattle are transported they are tested and checked on,” she said, adding that the protocol had identified one case of New World screwworm.

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On Tuesday, the New York-based Wildlife Conservation Society said evidence linked the resurgence of the screwworm – which often enters through open wounds and eats living flesh – to illegal cattle trafficking across Central America.

WCS’ Mesoamerica director Jeremy Radachowsky said in a statement that traffickers bypassing sanitary controls with often stressed, injured or undernourished livestock created “ideal conditions” for the transmission of diseases and parasites such as the screwworm.

“If the parasite establishes itself in Mexico, it could lead to decades of costly eradication efforts,” he said.

The case was identified in Chiapas state, where in the 1970s a factory developed millions of sterile male NWS flies in order to reduce wild populations. Female screwworms mate only once and do not reproduce if they do so with the sterile screwworms.

Mexico decreed the plant’s closure in 2013, ten years after Chiapas state was declared free of the pest.

About the author

Geralyn Wichers

Geralyn Wichers

Digital editor, news and national affairs

Geralyn graduated from Red River College's Creative Communications program in 2019 and launched directly into agricultural journalism with the Manitoba Co-operator. Her enterprising, colourful reporting has earned awards such as the Dick Beamish award for current affairs feature writing and a Canadian Online Publishing Award, and in 2023 she represented Canada in the International Federation of Agricultural Journalists' Alltech Young Leaders Program. Geralyn is a co-host of the Armchair Anabaptist podcast, cat lover, and thrift store connoisseur.

 

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