الفهرس 
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Abstract
This work was done to study the various bacterial species causing intestinal disturbances in infants in Sharkia governorate with further assessment and iden-tification of the causative organisms :
1-The study included 150 diarrhoeal cases, their ages varied between two months up to five years.
2-Rectal swabs of stools were examined microscopically and then cultured on simple and selective media.
3-Pathogenic organisms were isolated from 78 cases constituting (52%) total isolation rate. Escherichia coli was isolated from 30 cases (38.46%) salmonella was isolated from 17 cases (21.79%) shigella from 8 cases (10.25%), Staphylococcus aureus from 7 cases (8.97%), proteus from 7 cases (8.57%) and klebsiella from 9 cases (11.63%).
4-Using agglutinating antisera polyvalent I and polyvalent II for typable isolated E. coli strains. Also salmonella isolates were subjected to serological identification by using slide agglutination technique.
5-Infection was predominant in infants above 6 months of age. Escherichia coli was the most frequent cause of diarrhea and it was more common in infants and children during the first two years of age, while the lowest rate of E. coli strains were isolated above 2 years old. This leads to the conclusion that these strains were nightly pathogenic in the first 2 years of life. Salmonella and shigella were more frequently isolated from children above one year of age.
6-Gastro-enteritiS was more frequent in infants during feeding on Cow’s milk or external diet.
7-Breast-fed infants are less likely to be infected than infants given an artificial diet.