الفهرس 
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Abstract
SUMMARY
Diarrhoea is the commonest disorder aflecting the Egyptian infants below two years of age and the commonest causes of morbidity and mortality among Egyptian infanta tsnd p re- school children. Diarrhoea is defined as excessive losses of fluid and electrolytes from the gastro intestinal tract. The infectious agents that cause diarrhoea are usually spread by the f ecal^oral route which include the ingest ion of fecally contaminated water or food and also direct contact with infected feces.
Diarrhoeal disease are heterogenous in etiology, they jndy be due to enteral infection caused by a wid£ variety of viruses, bacteria, parasites and other non infectious etiological causes.
Dehydration is the commonest and the most serious complicat ion of diarrhoea. Dehydration is class!fied either according to its severity into mild- moderate and severe or according to s^rum sodium concentration into hypernatreamic, hyponatraemic and Isonatraemic dehydration. The most important line of treatment of dehydration is the rehydration therapy which consists of oral rehydration solution and nutritional therapy.