Canada blocks some Texas-linked cattle and horses over screwworm cases (opens in new tab)

Canada’s food inspection agency temporarily barred cows and horses from entering the country if they had been in Texas within 21 days before reaching the border, after U.S. officials confirmed New World screwworm cases in calves in South Texas. The measure targets a parasitic fly whose larvae can feed on living tissue in warm-blooded animals and, if untreated, can kill the host. U.S. officials said the first Texas case in about 60 years involved a three-week-old calf in La Pryor, about 30 mil...