摘要 : Two hundred raw milk and dairy product samples (50 cow milk and 25 each of sheep milk, goat milk, pasteurized milk, white soft cheese, plain yoghurt and fruit yoghurt) were collected from dairy farms and different localities, mark... 展开 Two hundred raw milk and dairy product samples (50 cow milk and 25 each of sheep milk, goat milk, pasteurized milk, white soft cheese, plain yoghurt and fruit yoghurt) were collected from dairy farms and different localities, markets and shops in El Dakahlia Province, Egypt, [date not given] and examined for the presence of <i>Listeria</i> and <i>Yersinia</i> spp. species as food poisoning and mastitis causing organisms. The incidence of <i>Listeria</i> spp. in raw milk and dairy product samples was 3.0% and their distributions were 6.0% in cow milk, 8.0% in goat milk, 4.0% in white soft cheese samples and no detection in sheep milk, pasteurized milk and both fruit and plain yoghurt samples. The incidence of <i>L. monocytogenes</i> in raw milk and dairy product samples was 3 (1.5%), while other <i>Listeria</i> spp. were <i>L. innocua</i> 5 (2.5%) and <i>L. welshimeri</i> 2 (1.0%). <i>Yersinia</i> spp. were isolated from 41 (20.5%) of the examined raw milk and dairy product samples. The incidence percentages were 40.0% in cow milk, 20.0% in sheep milk, 32.0% in goat milk, 4.0% in pasteurized milk, 8.0% in white soft cheese, 12.0% in fruit yoghurt and 8.0% in plain yoghurt. <i>Y. enterocolitica, Y. intermedia, Y. kristensenii, Y. frederiksenii</i> and <i>Y. pseudotuberculosis</i> were detected in 5, 1, 2, 0, 1, 1 and 1; 10, 2, 0, 1, 2, 0 and 0; 3, 0, 0, 0, 0, 1 and 1; 0, 3, 4, 0, 0, 0 and 1 and 4, 0, 4, 0, 0, 2 and 0 of the samples, respectively. The sanitary and public health importance of these organisms as well as control measures to improve the quality of dairy products and to safeguard the consumers from infection are discussed. 收起