Incidence of L. monocytogenes in foods. L. monocytogenes was isolated from 25.3% of the total food samples purchasedfrom the local markets (Table 1). High incidences were found in the raw meat samples, such as pork, chicken carcasses, turkey parts, and beef steaks, while no samples of the Chinese pickles and fermented milk products were contaminated (Table 1). L. monocytogenes was isolated from 2 of 45 samples of frozen cooked foods (frozen dim sum). L. monocytogenes was isolated only from lettuce, Chinese cabbage, and green onion among a variety of fresh produce and only from fish and squid samples among the seafoods examined.