Insights and Stories on Screwworm

Animal health worker Eduardo Lugo treats the wounds of a cow as Chihuahua ranchers intensify surveillance for the screwworm after the U.S. suspended cattle imports following the detection of the parasite in southern Mexico, at the Chihuahua Regional Livestock Union, in Nuevo Palomas, Mexico May 16, 2025.

U.S. again halts cattle imports from Mexico over flesh-eating screwworms

Jul. 10, 2025 at 10:03 am CDT

The flesh-eating livestock pest New World screwworm has advanced closer to the U.S. border with Mexico, the U.S. Department of Agriculture said, prompting Washington to block imports of Mexican cattle just days after it allowed them to resume at a port of entry in Arizona.

Black Angus breed cattle in a feedlot or feed yard. Ear tags and electronic monitoring tags have been touched up to removed distinguishing numbers and features

Mexico to open sterile fly plant to combat screwworm in 2026

Jul. 7, 2025 at 4:54 pm CDT

By Reuters

USDA announces phased reopening of Mexican cattle imports after screwworm closure

Jun. 30, 2025 at 5:29 pm CDT

By Karl Plume Reuters

USDA plans sterile fly facility in Texas to combat screwworm

Jun. 18, 2025 at 3:54 pm CDT

By Leah Douglas Reuters

USDA mission to travel to Mexico with eye toward lifting cattle import suspension, Mexico says

May. 28, 2025 at 11:11 am CDT

By Reuters

Close up of a syringe veterinarin is holding to vaccinate a cow in a barn.

Changing spread, prevalence of animal diseases causes new challenges for food, agriculture

May. 28, 2025 at 10:22 am CDT

Animal health is a critical component of public health, food security and economic stability in an increasingly interconnected world, says the World Organisation for Animal Health (WOAH) in its inaugural report.

By Phil Franz-Warkentin

U.S. agriculture secretary Brooke Rollins speaks to the media at the Commodity Classic in Denver.

U.S. suspends Mexican cattle, horse and bison imports over New World screwworm

May. 12, 2025 at 9:41 am CDT

U.S. Agriculture Secretary Brooke Rollins on Sunday said she is suspending imports of live cattle, horses and bison through the southern U.S. border over the damaging pest New World screwworm, a measure that immediately drew opposition from Mexico.

By Reuters

A group of cattle in an Alberta feedlot in the summer.

US and Mexico have reached agreement on New World screwworm, Ag Secretary Rollins says

Apr. 28, 2025 at 10:27 am CDT

President Donald Trump's administration warned on Saturday that it will restrict livestock imports from Mexico if that country's government does not intensify its fight against a damaging pest called New World screwworm.

By Reuters

cattle and a barbed wire fence at sunset

US will allow Mexican beef imports to resume, says Mexican minister

Feb. 1, 2025 at 1:37 pm CST

The United States will permit Mexican beef imports to resume after signing memorandums to lift a temporary suspension, Mexico's agriculture chief wrote in a post on social media site X on Saturday.

By Reuters

USDA says it has not set Jan. 20 as date to resume Mexican cattle imports

Jan. 9, 2025 at 9:42 am CST

The U.S. Department of Agriculture has not established Jan. 20 as a date to resume cattle imports from Mexico, the agency said on Wednesday, after it blocked shipments in November over the discovery of the New World screwworm pest in Mexico.

By Reuters

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Insights and Stories on Screwworm

U.S. again halts cattle imports from Mexico over flesh-eating screwworms

Mexico to open sterile fly plant to combat screwworm in 2026

USDA announces phased reopening of Mexican cattle imports after screwworm closure

USDA plans sterile fly facility in Texas to combat screwworm

USDA mission to travel to Mexico with eye toward lifting cattle import suspension, Mexico says

Changing spread, prevalence of animal diseases causes new challenges for food, agriculture

U.S. suspends Mexican cattle, horse and bison imports over New World screwworm

US and Mexico have reached agreement on New World screwworm, Ag Secretary Rollins says

US will allow Mexican beef imports to resume, says Mexican minister

USDA says it has not set Jan. 20 as date to resume Mexican cattle imports

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