10/18/2017 Listeriosis and foods Listeriosis and foods Meat and poultry products Seafoods L.monocytogenes depends on the type of Isolated from fresh,frozen and meat,pH,presence of other bacteria processed seafood ·Grows best in poultry High-risk foods are molluscs and salted, Concentrates in the kidney,lymph nodes, marinated,fermented and cold-smoked liver and spleen of animals fish as well as heat-processed fish Meats packaged in brine favor growth products Once established in a food plant Lm can persist for years Environmental Sources Food Processing Plants Enters food-processing plants via shoes, Ubiguitous in the environment clothing,and vehicles Survive and grow in many water Enters facility via raw vegetable,animal environments tissue,and human carriers Pasture grasses and grass silages High humidity and nutrient levels Feces of health animals;animals can get promotes growth-floor drains, listeriosis stagnant water,floors,residues Patients of listeriosis and carriers of equipment Listeria shed the microbe Attaches to surfaces,stainless steel, rubber,and glass 10/18/2017 6 Listeriosis and foods Meat and poultry products • L. monocytogenes depends on the type of meat, pH, presence of other bacteria • Grows best in poultry • Concentrates in the kidney, lymph nodes, liver and spleen of animals • Meats packaged in brine favor growth • Once established in a food plant Lm can persist for years Listeriosis and foods Seafoods • Isolated from fresh, frozen and processed seafood • High-risk foods are molluscs and salted, marinated, fermented and cold-smoked fish as well as heat-processed fish products Environmental Sources • Ubiquitous in the environment • Survive and grow in many water environments • Pasture grasses and grass silages • Feces of health animals; animals can get listeriosis • Patients of listeriosis and carriers of Listeria shed the microbe Food Processing Plants • Enters food-processing plants via shoes, clothing, and vehicles • Enters facility via raw vegetable, animal tissue, and human carriers • High humidity and nutrient levels promotes growth – floor drains, stagnant water, floors, residues, equipment • Attaches to surfaces, stainless steel, rubber, and glass