A ranch worker drives cattle to a corral for inspection for New World screwworm at a ranch in Cintalapa, Chiapas, Mexico, Wednesday, July 23, 2025, amid an infestation that led the U.S. to suspend cattle imports over fears the pest could reach the border. (AP Photo/Isabel Mateos)

By The Canadian Press

Canada temporarily blocking livestock from Texas due to New World screwworm

Jun 5, 2026 | 5:22 PM

OTTAWA — Canada is temporarily restricting the import of livestock from Texas over concerns about a parasitic fly with flesh-eating larvae.

The Canadian Food Inspection Agency said animals that are from Texas or were present in the state within 21 days of a border crossing will not be allowed into the country.

It comes after an infestation of New World screwworm fly larvae was confirmed this week in a calf in Texas. It’s the first case confirmed in the state since 1966.

The agency said several U.S. states have also taken precautionary measures to mitigate the risk of spread.

“The CFIA will continue to work closely with U.S. counterparts to assess developments and adjust measures as needed,” it said in a news release Friday.

What's On

Top five things to do at the Medicine Hat Public Library in June

Jun 01, 2026

Smile Sundays

NAOAGA tournament starts Monday at Connaught Golf Club, Medicine Hat's Florkowski looks for seventh win

May 31, 2026

What's On

Here is what's on in Medicine Hat this weekend: May 29-31

May 29, 2026

Screwworms can infest livestock, pets, wildlife, birds and even people in rare cases, the agency said. They’re not found in Canada and can’t survive winter temperatures, preferring hot and humid environments, it said.

U.S. officials have been quick to stress that the fly’s larvae — which feed on living material — do not infest meat or fruit.

Officials in Canada are asking animal owners and veterinarians to watch for signs of screwworm infestation in livestock, including wounds that worsen over time and are accompanied by discharge or foul odour.

Canadians travelling to Texas with pets are encouraged to inspect them for any signs of the screwworm.

This report by The Canadian Press was first published June 5, 2026.

— with files from The Associated Press

The Canadian Press

by The Canadian Press

Canada temporarily blocking livestock from Texas due to New World screwworm

Our Community