Occurrence of Listeria monocytogenes in Raw Milk and Dairy Products in Noorabad, Iran

The presence of Listeria monocytogenes was investigated in a total of 360 raw milk and dairy product samples including white cheese, yoghurt and Iranian yoghurt drink (Doogh) that were collected during five months from two traditional dairy manufacturer in Southern Iran. The prevalence of Listeria monocytogenes in raw milk and white cheese samples of manufacturer A was found to be 1.7 and 3.3%, respectively and of manufacturer B was found to be 3.3 and 6.7%, respectively. No Listeria monocytogenes was isolated in any of the yoghurt and Doogh samples of both manufacturer probably because of their low pH values.