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New World screwworm reappears in Texas for the first time in 60 years, putting the livestock industry on alert

The confirmation of a case of the New World screwworm (NWS) in Texas set off alarm bells across the United States, marking the return of a pest that had been eradicated from the country more than half a century ago. The discovery comes at a particularly sensitive time for the livestock industry, which is facing the smallest cattle herd in 75 years and record-high beef prices, raising concerns about the potential economic consequences of a spread of the parasite.

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© Daniel Becerril (REUTERS)

Borer worm larvae in Chiapas, in October 2025.
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