The voluntary recall affects all packages of Dole's Hearts Delight salad mix sold in the United States and Canada with a "best if used by" date of September 19, 2007, and a production code of "A24924A" or "A24924B," Dole said.

The product was sold in Ontario, Quebec and the Maritime Provinces in Canada and in Illinois, Indiana, Maine, Michigan, Mississippi, New York, Ohio, Pennsylvania, Tennessee and neighboring U.S. states starting the weekend before last, said Marty Ordman, a Dole spokesman.

The Canadian agency said it would be looking to find out at what point the salad blend, which is imported into Canada, became contaminated and to see if any other products are affected, spokesman Garfield Balsom said.