الفهرس 
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Abstract
One hundred random samples of raw cow’s milk and 50 of each small-scale plain yoghurt and Kariesh cheese were collected from different dairy shops and markets in Zagazig City, Sharkia Governorate, Egypt under hygienic condition during the period of February to August 2020 and examined for their bacteriological quality.
Incidence of E. coli in the examined raw milk, yoghurt and Kariesh cheese was 47%, 36% and 50% respectively.
All positive samples for E. coli were submitted for biochemical (IMViC test) and serological identification.
Serotyping of isolated E. coli in raw milk samples was O25, O26, O44, O55, O78, O86, O114, O119, O125, O127, O158 and O168 bypercentages of 10.64, 21.27, 8.51, 14.89, 4.26, 4.26, 6.38, 6.38, 8.51, 4.26, 4.26 and 6.38%, respectively.
Serotyping of isolated E. coli in yoghurt samples was O25, O26, O55, O86, O114, O125, O127, O158 and O168 bypercentages of 5.56, 27.77, 11.11, 5.56, 5.56, 16.66, 11.11, 11.11 and 5.56%, respectively.
Serotyping of isolated E. coliin Kariesh cheese samples was O25, O26, O44, O55, O78, O114, O119, O125, O127, O158 and O168 bypercentages of 8.00, 28.00, 4.00, 8.00, 4.00, 8.00, 4.00, 16.00, 4.00, 8.00 and 8.00%, respectively.