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Kraft is voluntarily recalling some of its Kraft and Polly-O string cheese because it may spoil and change color before the expiration date on the packages.

The Northfield, Ill., company said Friday that about 735,000 cases of the affected products were shipped to customers in the U.S. Kraft Foods Group Inc. says it issued the recall after receiving several reports from consumers about cheese going bad.

The company has ceased the production and distribution of the affected products and is investigating the problem.

Consumers should not eat the recalled product and should return it for an exchange or refund.

Consumers who purchased any product listed above should not eat it. They should return it to the store where purchased for an exchange or full refund.

Consumers also can contact Kraft Foods Consumer Relations at 1-800-816-9432 between 9 am and 6 pm (Eastern).