Insights and Stories on Screwworm

Larvae of the screwworm fly, collected from infected cows, are observed at the COPEG sterile fly production plant, which fights the spread of the cattle screwworm, in Pacora, Panama, June 11, 2025. REUTERS/Enea Lebrun/File Photo

Mexico sees 32 per cent jump in flesh-eating screwworm cases since August as cases move north

Oct. 1, 2025 at 2:06 pm CDT

Mexico recorded 6,703 cases of animals infested with New World screwworm as of September 13 since the start of the outbreak in November of last year. That was compared to 5,086 confirmed cases during the previous period, which ended August 17.

Black Angus breed cattle in a feedlot or feed yard.

U.S. criticizes Mexico’s handling of screwworm near border

Sep. 26, 2025 at 9:50 am CDT

By Reuters

A Mexican farmer sprays disinfectant on the head of a brown beef cow.

Mexico confirms case of New World screwworm in northern state, USDA says

Sep. 22, 2025 at 10:05 am CDT

By Reuters

Mexico reports 53 per cent increase in flesh-eating screwworm cases since July

Aug. 28, 2025 at 9:56 am CDT

By Cassandra Garrison Heather Schlitz Reuters

Cattle walk through a fenced channel at a feedlot

U.S. cattle ranchers criticize government for delayed reporting of human screwworm case

Aug. 26, 2025 at 9:58 am CDT

By Leah Douglas Reuters Tom Polansek

U.S. confirms nation’s first travel-associated human screwworm case connected to Central American outbreak

Aug. 25, 2025 at 9:53 am CDT

The U.S. Department of Health and Human Services on Sunday reported the first human case in the United States of travel-associated New World screwworm, a flesh-eating parasite, from an outbreak-affected country.

By Cassandra Garrison Leah Douglas Reuters Tom Polansek

Cattle buyers view beef cattle in the ring at Grunthal Auction Mart in southeast Manitoba.

U.S. livestock: Feeders set fresh highs, hogs mixed

Aug. 19, 2025 at 4:42 pm CDT

Chicago cattle futures ended Tuesday mostly up, with feeder contracts setting fresh highs. Hogs were mixed.

By Geralyn Wichers

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.

USDA to build Texas facility to fight flesh-eating screwworm

Aug. 15, 2025 at 2:04 pm CDT

The U.S. Department of Agriculture will spend up to $750 million to build a sterile fly production facility in Texas to fight the flesh-eating livestock pest New World screwworm, USDA Secretary Brooke Rollins said on Friday, Aug. 15.

By Leah Douglas Reuters Tom Polansek

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.

By Reuters Tom Polansek

Mexico to open sterile fly plant to combat screwworm in 2026

Jul. 7, 2025 at 4:54 pm CDT

Mexico's government said on Monday that it has started to build a $51 million (C$69.8 million) facility in the country's south as part of an effort to combat screwworm, a pest that has disrupted Mexican exports of cattle to the United States.

By Reuters

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Insights and Stories on Screwworm

Mexico sees 32 per cent jump in flesh-eating screwworm cases since August as cases move north

U.S. criticizes Mexico’s handling of screwworm near border

Mexico confirms case of New World screwworm in northern state, USDA says

Mexico reports 53 per cent increase in flesh-eating screwworm cases since July

U.S. cattle ranchers criticize government for delayed reporting of human screwworm case

U.S. confirms nation’s first travel-associated human screwworm case connected to Central American outbreak

U.S. livestock: Feeders set fresh highs, hogs mixed

USDA to build Texas facility to fight flesh-eating screwworm

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

Mexico to open sterile fly plant to combat screwworm in 2026

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