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Mexico sees 32% jump in flesh-eating screwworm cases since August as cases move north

Mexico recorded 6,703 screwworm cases by mid-September, up 32% since August, with cattle making up most infections and cases spreading toward the U.S. border.

  • Senasica's September 26 report found a nearly 32% increase in confirmed New World screwworm cases, with infections becoming more concentrated as they move northward through Mexico.
  • Mexico recorded by September 13 that animal infestations exceeded counts through August 17 since the New World screwworm outbreak began last year.
  • State-Level data show Chiapas state remains most affected, Veracruz state cases nearly doubled, and Puebla state recorded confirmed cases for the first time about 80 miles from Mexico City.
  • The spread has triggered a diplomatic spat as the U.S. blames Mexico for containment gaps, keeping its border mostly closed to Mexican cattle since May while about 42,000 USDA staff were furloughed Wednesday.
  • Mexico confirmed on September 21 that a Nuevo Leon case was treated promptly, most infections involved cattle, and the United States reported a travel-associated human case earlier this year.
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Mexico sees 32% jump in flesh-eating screwworm cases since August as cases move north

Mexico saw a nearly 32% increase in confirmed cases of the flesh-eating screwworm parasite, according to the latest monthly government data, as a concentration of cases moves north.

·United Kingdom
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El EconomistaEl Economista
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Aristegui NoticiasAristegui Noticias

The spread of the cattle sweeper worm as it approaches the U.S. border has led to a diplomatic confrontation between the two trading partners.

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Reuters broke the news in United Kingdom on Tuesday, September 30, 2025.
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