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WALNUT GROVE — At least five cases of botulism have the California Department of Public Health investigating a Sacramento convenience store.

Multiple people who purchased prepared food from the Valley Oak Food and Fuel gas station in Walnut Grove have reportedly been diagnosed with botulism.

Officials are warning customers who may have purchased and eaten food from the store between April 23 and now.

One daily customer told FOX40 that no hot food is prepared at the gas station. He said he often buys pre-packaged sandwiches but has never gotten sick from the food.

Those who think they may have contracted the rare and potentially fatal illness should seek immediate medical care. Symptoms of botulism include double vision, blurred vision, drooping eyelids, slurred speech, difficulty swallowing, dry mouth and muscle weakness.