Mexico tightens cattle movement to curb screwworm spread Import ban from US strains beef supply chain15 May 2025 15 May 2025 2 minute read 2 minute read By: By: Global Ag Media North AmericaMexico will tighten the flow of cattle from the south of the country to limit the potential spread of the screwworm, Reuters reported, citing the nation's agriculture minister on Tuesday. The screwworm, which can kill cattle or other hosts within weeks, has recently been detected in the south of Mexico and has caused the US to suspend imports of cattle, horses and bison from its neighbour. The clampdown from Mexico is in response to the US suspension of cattle imports, though Berdegue said on Tuesday that Mexico was complying "100%" with the US' demands. The suspension threatens to increase US beef prices by further tightening already-limited supply, while hurting ranchers in Mexico. Technical measuresSince June, Mexico's agriculture ministry has spent more than 167 million pesos ($8.60 million) to combat the pest, it said in a Monday statement.