Survival of Listeria monocytogenes in Raw Milk

This study was conducted on different raw milk samples (cow, buffalo, sheep, goat) and pasteurized "Nada" milk was used as a control sample after confirming that it is free from any microbial contamination. Mesophilic aerobic bacteria (microbiota) was enumerated in all raw milk samples. Different concentrations of Listeria monocytogenes were inoculated at different dilutions of raw milk to detect the survival of this bacterium with the presence of microbiota in milk .The results showed the ability of Listeria monocytogenes to survive in raw milk samples with low levels of microbiota while it can not grow in the samples with high levels of microbiota and this survival differs with different origins of raw milk samples under study