Louisiana Puts Restrictions on Animals Entering State After Screwworm Reaches Texas

Louisiana has imposed new restrictions on animals entering the state following the confirmation of five New World screwworm cases in the United States. The flesh-eating parasite, which lays eggs in wounds and body openings of warm-blooded animals, can cause severe infections and death if untreated. While livestock are most vulnerable, wildlife and pets can also be affected. Human infections remain rare.

The outbreak began with an infected calf in Zavala County, Texas, near the Mexican border, and additional cases have since been identified in Texas and New Mexico. Concern is growing as the parasite spreads northward from Mexico, where more than 185,000 animal infections have been reported since 2024.

In response, Louisiana’s state veterinarian issued an emergency order requiring animals entering from affected states to have recent health inspection certificates and, in some cases, special permits. Animals originating from or passing through infected zones face additional movement requirements. State officials are urging residents to report suspected cases immediately as authorities work to prevent the parasite from spreading into Louisiana.