Texas tightens animal movement controls amid New World screwworm detection

New restrictions on livestock, fowl, and exotic animals come into force following the first confirmed case of New World screwworm in Zavala County, aiming to contain the parasite and prevent wider outbreaks disrupting trade and livestock health.

Texas has tightened animal-movement controls after New World screwworm was detected in the state, adding fresh compliance duties for producers, transporters and veterinarians. The rules are designed to reduce the risk that the parasite, which can infest livestock and wildlife, spreads beyond already affected areas and disrupts trade in cattle, horses, poultry and exotic species.

According to the Texas Animal Health Commission, the executive director’s order applies to livestock, exotic livestock, fowl and exotic fowl coming from states where an active New World screwworm infestation, quarantine or control zone remains in place. It sets separate protocols for animals moving from infested and non-infested zones, for shipments bound for Texas slaughter plants, for indirect movement through livestock markets, and for Texas-origin animals returning from affected areas.

The order took effect immediately and will stay in force until amended. It sits alongside existing entry requirements under Texas law and administrative rules, reflecting the state’s effort to keep animal health controls aligned with a threat that the commission says was first confirmed in Texas on June 3, 2026, in Zavala County.

New World screwworm larvae feed on living tissue and can cause serious losses in herds and flocks. The Texas agency says it is working with federal partners, while the US Department of Agriculture’s Animal and Plant Health Inspection Service has also moved to release two infested zones in Texas, signalling progress but not an end to the regulatory burden.

Link: https://www.tahc.texas.gov/regs/entry.html