S&M International Inc. of Bayonne, N.J., is recalling Yang Sheng cooked salted duck eggs due to a possible contamination of Clostridium botulinum, the bacteria that causes botulism. The recalled product was distributed between August and October 2012 to locations in New York, Pennsylvania, Virginia and Michigan. The product is vacuum-packed in plastic with six eggs per 12.69 oz. package bearing the UPC 6949682803568. The lot code YS12-02C is printed on the product’s boxes. The New York State Department of Agriculture & Markets discovered that the product was not being processed in a manner to prevent the growth of harmful bacteria. Customers who purchased the product should discard it or return it to the point of purchase for a full refund. Symptoms of botulism poisoning include double vision, blurred vision, drooping eyelids, slurred speech, difficulty swallowing, dry mouth, and muscle weakness, according to the Centers for Disease Control and Prevention.