Pollution monitoring for Listeria monocytogenes in food of Heilongjiang province

Object To know the polluting status of Listeria monocytogenes in food in Heilongjiang province and build up pollution database of Listeria monocytogenes in food.Method 6 representative cities were selected to build surveillance spots and 6 kinds of food were collected as samples regularly.Firstly,bacteria were increased in culture medium(LB1,LB2).Secondly,they were isolated in CHROMagar color-medium.Then,they were identified by corresponding biochemical reaction and fast reaction identification plate of Listeria.Result 6 kinds of 760 food samples were detected with Listeria monocytogenes(L.m) and detection rate was 5.66%.Conclusion The food in Heilongjiang province is polluted by L.m in varying degrees.The worst pollution is in fresh meat and fowl and non-shaped packing cooked meat.Freshwater products are the second and pollution in eaten raw vegetables is rare.

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