CHICAGO — Conagra Brands, Inc. said it is working with health officials with the Centers for Disease Control and Prevention and the Food and Drug Administration after a positive finding of Salmonella in a retail sample of Duncan Hines Classic White cake mix. The sample may be linked to a Salmonella outbreak that is being investigated by the C.D.C. and the F.D.A., Conagra said.

“While it has not been definitively concluded that this product is linked to the outbreak and the investigation is still ongoing, Conagra has decided to voluntarily recall the specific Duncan Hines variety identified (Classic White) and three other varieties (Classic Butter Golden, Signature Confetti and Classic Yellow) made during the same time period out of an abundance of caution,” the company said.

According to Conagra, five occurrences of illnesses due to Salmonella are being examined by the C.D.C. and the F.D.A. as part of the investigation.

“Several of the individuals reported consuming a cake mix at some point prior to becoming ill, and some may have also consumed these products raw and not baked,” Conagra said. “Consumers are reminded not to consume any raw batter. Cake mixes and batter can be made with ingredients such as eggs or flour, which can carry risks of bacteria that are rendered harmless by baking, frying or boiling. Consumers are reminded to wash their hands, work surfaces and utensils thoroughly after contact with raw batter products, to follow baking instructions and to never eat raw batter.”