10/18/2017 Food Processing Plants Food Processing Plants L.monocytogenes contaminates carcasses from L.monocytogenes does not survive heat feces during slaughter processing 11-52%of healthy animals are fecal carriers Processed food is contaminated Heavily contaminated areas primarily by post-process contamination -cow dehiding Lm is difficult to remove from -pig stunning processing plants as it forms biofilms in hoisting hard to reach areas Turkey and poultry slaughterhouses found Lm Sanitation is difficult associated with drip water,chill water Lm is found in raw materials so it is overflow,and recycled cleaning water easily reintroduced into facilities. Circulation of Listeria Potential Routes of Transmission of monocytogenes Listeria monocytogenes Animals Dirt,silage and Human Food-processing consumption plants Fruits,plants and vegetables10/18/2017 7 Food Processing Plants • L. monocytogenes contaminates carcasses from feces during slaughter • 11-52% of healthy animals are fecal carriers • Heavily contaminated areas - cow dehiding - pig stunning - hoisting • Turkey and poultry slaughterhouses found Lm associated with drip water, chill water overflow, and recycled cleaning water Food Processing Plants • L. monocytogenes does not survive heat processing • Processed food is contaminated primarily by post-process contamination • Lm is difficult to remove from processing plants as it forms biofilms in hard to reach areas • Sanitation is difficult • Lm is found in raw materials so it is easily reintroduced into facilities. Circulation of Listeria monocytogenes Potential Routes of Transmission of Listeria monocytogenes