Cattle in a feedlotMexico is experiencing a sharp rise in New World screwworm (NWS) cases. Government data shows 5,086 animal infestations as of August 17. This is a 53% increase since July. Of these infestations, 649 remain active.

Cattle industry leaders warn the surge indicates the outbreak is not under control. CEO of conservation and cattle group East Foundation Neal Wilkins called the growth absolutely concerning. National Cattlemen’s Beef Association (NCBA) stressed the need for aggressive prevention, including funding for a U.S. sterile fly facility, stronger surveillance, and screening measures.

The increase partly reflects improved reporting as Mexican cattle producers more actively inspect and document suspicious wounds. Authorities emphasize vigilance, noting NWS affects multiple species, not just livestock. Most cases have been found in cattle (85%), but infestations have also been confirmed in dogs (6%), swine (3%), horses (3%), and sheep (2%).

Geographically, the threat is moving closer to the U.S. border. Mexico’s agricultural health agency recently confirmed a case in Veracruz, just 370 miles south of Texas.

Read more about the continued expansion of NWS across Mexico here.