All but five elk shot by wildlife officers near Stony Plain have been tested for chronic wasting disease and come up negative.

Government spokesman Dave Ealey says 28 elk were shot by Fish and Wildlife staff after they were discovered roaming free earlier this fall.

Of those, 23 produced brain tissue samples suitable for tests for chronic wasting disease, an affliction similar to mad cow disease.

Officials are confident they captured all the animals, which they believe were farm-raised and trucked to the area and released on purpose.

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