New case of New World screwworm detected in Mexico

Mexico’s Ministry of Agriculture and Rural Development has reported a new case of New World screwworm (NWS) in Montemorelos, Nuevo León, which originated in the south-southeast of the country.

Ann Reus
October 7, 2025
Herd of brown and white cattle grazing in grassy field with forest backdrop
sherjaca | BigStock.com

Mexico’s Ministry of Agriculture and Rural Development has reported a new case of New World screwworm (NWS) in Montemorelos, Nuevo León, which originated in the south-southeast of the country.

In this case, the ministry said, the larvae were either dead or poisoned by the antiparasitic ivermectin and the larvicidal dip, which are mandatory in the dual treatment established as part of the new protocol against NWS.

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