US allows movement in Texas as New World screwworm zones are reduced

The USDA has approved the release of two infested zones in Texas, easing containment measures following the parasite’s resurgence and marking a cautious step forward in managing the outbreak.

The US Department of Agriculture’s Animal and Plant Health Inspection Service has approved the release of two New World screwworm infested zones in Texas, a sign that containment measures are beginning to ease after the parasite’s return to the state.

According to APHIS, the decision was taken with the concurrence of Texas state veterinarian Bud Dinges and the Texas Animal Health Commission. The zones lifted are in parts of La Salle and Webb counties, and in parts of Gillespie, Kerr and Kimble counties.

USDA said the areas met the requirements in its response playbook after joint federal and state review. The release removes screwworm-related movement restrictions for livestock and pets within those zones, allowing normal intrastate and interstate transport without inspection for the parasite. Other animal health and export requirements remain in force.

APHIS first confirmed New World screwworm in Texas on June 3, after detecting the pest in a bovine in Zavala County. The agency later reported additional cases, including in La Salle County and Andrews County, and established movement controls, surveillance and sterile fly releases as part of its response.

Officials said several infested zones remain in place and further releases will depend on surveillance and field conditions. For producers, the immediate message is partial relief, not the end of the campaign.