AMERICAN FALLS, Idaho (AP) -- The number of birds killed by botulism in a Southern Idaho reservoir continues to rise, with biologists tallying more than 5,000 waterfowl deaths.

Idaho Department of Fish and Game regional manager Toby Boudreau said the outbreak will likely continue until the region gets about a week of cold weather -- long enough to kill off the toxic bacteria in the American Falls Reservoir.

The Fish and Game Department is warning people to keep dogs away from the northern shore. Boudreau also said hunters should avoid touching or shooting sick-looking ducks.

Boudreau said this is the first botulism outbreak at the reservoir since 1996, when about 10,000 birds died.

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