Occurrence of some enteric pathogens in raw milk and some dairy products

ABSTRACT

110 samples of dairy products were collected from different localities and farmer's houses [40 raw milk samples, 20 raw cream samples, 30 Kariesh cheese samples and 20 yoghurt samples]. Samples were examined microbiologically for the presence of enteric pathogens. In raw milk, E. coli, Shigella dysenteriae, Salmonella enterica indiana gr. B [04, 12-H, Z-H2 1, 7], Yersinia enterocolitica and klebsilla pneumoniae could be isolated from 27.5%, 7.5%, 2.5%, 5% and 2.5% of examined samples respectively In raw cream, E coil and Shigella dysenteriae could be isolated from 15% and 5% of examined samples respectively. In Kariesh cheese, E. coli, Shigella dysenteriae, Salmonella enterica indiana, yersinia enterocolitica and Kiebsilla pneumoniae could be isolated from 43.3%, 16.6%, 3.3%, 3.3% and 6.6% of examined samples respectively. For yoghurt, E. coil and Yersinia enterocolitica could be isolated from 20% and 10% of examined samples respectively. From different 25 tested strains, 17 strains [68%] were positive for production of enterotoxin [7 strains of E. coli, 3 strains of Shigella dysenteriae, 2 strains of Salmonella enterica indiana, 3 strains of Klebsilla pneumoniae and 2 strains of Yersinia enterocolitica]. The public health importance of isolated organism as well as recommendation for prevention of microbial contamination of dairy products were also discussed