Ellen Garrison of the Sacramento Bee reports today that the Sacramento County Public Health officials are investigating the Valley Oak Food and Fuel gas station in Walnut Grove after several customers who ate prepared food from the station contracted botulism.

A county press release said the department is collaborating with the state Department of Public Health and the county Department of Environmental Management, which has the authority to stop the sale of prepared food at the gas station.

Botulism is a rare and potentially fatal type of food poisoning caused by a bacteria called Clostridium botulinum, according to the Mayo Clinic. Symptoms include double vision, drooping eyelids, difficulty swallowing, slurred speech, dry mouth and muscle weakness. The county is asking that anyone experiencing these symptoms after eating prepared food at the gas station from April 23 through Sunday contact their healthcare provider.