BETHEL, Alaska — The Yukon-Kuskokwim Health Corporation says a sample of native salad from the Cama-i Dance Festival has preliminarily tested positive for botulism bacteria.

KYUK-AM reported Saturday that there has been one case of botulism in an adult who ate the salad, which contains whale and whale oil.

The health corporation says the bacterial toxin may not be evenly distributed throughout food, which could be why only one person has reported feeling ill.

The radio station reports that botulism is usually found in fermented or canned foods that were incorrectly stored or prepared. It can be deadly if left untreated.

Symptoms usually appear one to three days after eating contaminated food.

It will take at least a week for the State Public Health Lab to confirm or deny the preliminary tests.