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US Suspends Mexican Cattle Imports While Scaling Up Screwworm Control Measures

The USDA is converting a Mexican fruit-fly facility to mass-produce sterile screwworm flies to stem the parasite’s northward advance.

View of livestock for export to the United States through the Jeronimo-Santa Teresa border crossing after U.S. Agriculture Secretary Brooke Rollins announced an agreement with Mexico on the management of the New World screwworm, following a threat to halt Mexican cattle imports due to the outbreak, at the Chihuahua Regional Livestock Union facility, outside Ciudad Juarez, Mexico April 29, 2025. REUTERS/Jose Luis Gonzalez/File Photo
Cattle are held in a corral before being exported to the United States through the Jeronimo-Santa Teresa border crossing after U.S. Agriculture Secretary Brooke Rollins announced an agreement with Mexico on the management of the New World screwworm, following a threat to halt Mexican cattle imports due to the outbreak, at the Chihuahua Regional Livestock Union facility, outside Ciudad Juarez, Mexico April 29, 2025. REUTERS/Jose Luis Gonzalez/File Photo
A side view of a screwworm is seen in this undated handout picture obtained by Reuters on May 12, 2025. USDA/Denisse Bonilla/Handout via REUTERS/File Photo
New World screwworm on leaf

Overview

  • The New World Screwworm has moved through southern Mexico and is now roughly 700 miles from the Texas border.
  • Washington halted all cattle imports from Mexico in May to protect U.S. herds and stabilize the beef supply.
  • The USDA has allocated $21 million to retrofit a Mexican production plant for sterile screwworm breeding and release.
  • A facility in Panama is already releasing 100 million sterile flies each week and experts call for more sites to check the parasite’s spread.
  • USDA estimates a domestic outbreak could cost Texas’s livestock industry $1.8 billion in losses and tighten cattle supply, putting upward pressure on beef prices.