الفهرس 
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Abstract
Lactic Acid Bacteria (LAB), which are considered to be the most useful microorganisms to society, are involved in the manufacture of thousands of fermented foods. They are also beneficial in these products.
In the intestinal tract good micro flora can provide a protective effect only when a proper balance is maintained among all the different bacteria that normally reside. If the normal bacteria can overgrow and become established, causing digestive and other health problems. These harmful bacteria are known as pathogenic bacteria and they have the ability to cause GI problems such as diarrhea or abdominal pain if not kept in check by the beneficial bacteria
Probiotic microorganisms were found to affect beneficially the host by improving intestinal microbial balance. they have also many benefits such as reducing the risk of diarrhea, normalize bowel movements, enhancing immune functions, reducing cholesterol levels, reducing the risk of eczema , protection from cancer and relief of lactose intolerance symptoms
LAB and Bifid bacteria are unalterably considered to be the main components of proboscis.
The aim of this investigation were to isolate and identify some probiotic stains from human origin (Brest fed healthy children) , study some characteristics of the identified strains and study the ability of some probiotic lactic acid bacteria to improve the human health.