A flesh-eating parasite has almost reached the US border. Should we be worried? | BBC Science Focus Magazine

A Flesh-Eating Parasite Nears the US Border

A deadly fly, once wiped out across North America, has resurfaced in northern Mexico, creeping closer to the US border.

In September, Mexican authorities confirmed a case of a deadly flesh-eating parasite in Nuevo León, less than 70 miles from the Texas border.

The finding marks the northernmost detection of Cochliomyia hominivorax – the New World screwworm – in decades, and the closest it’s been to the United States since its eradication there over half a century ago.

The discovery has set off alarm bells among US ranchers and veterinarians, who still remember the devastation this flesh-eating insect once caused.

The screwworm, a metallic blue-grey blowfly, appears ordinary until its larvae begin burrowing into the flesh of living animals.

Author's summary: A deadly parasite is nearing the US border, causing concern among ranchers and veterinarians.

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Science Focus Science Focus — 2025-10-16

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