updated 9/21/2007 9:15:54 AM ET 2007-09-21T13:15:54

Quong Hop & Co. of South San Francisco, Calif., is expanding its recall of tofu products, which might be contaminated with Listeria monocytogenes, to include products coded with two additional dates.

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Listeria is a microorganism that can cause serious or fatal infections in children, the elderly or those with weakened immune systems. No illnesses have been reported in connection with the products, the company said.

On Tuesday, the company announced a recall of all packages of Soy Deli tofu coded Dec. 17, 2007. This recall also included three products coded Sept. 23, 2007: the 30-ounce Soy Deli nigari tofu, the 12-ounce Soy Deli water packed tofu and the 16-ounce Quong Hop water packed tofu.

The recall was expanded to include the 30-ounce Soy Deli nigari tofu coded Oct, 17, 2007, and the 12-ounce Soy Deli water packed tofu coded Oct. 9, 2007.

The products were distributed throughout the Midwest and the West Coast in supermarkets and natural food stores, the company said.

Healthy adults who are infected with listeria can experience symptoms including high fever, severe headache, nausea and diarrhea. For more information, consumers can call the company at 650-553-9900.

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