By : Shaaban,M.T1., Hussien ,M.Z2., Allam N.G.3, Moustafa H.H.1

Abstract

The influences of Lactobacillus acidophilus, Bifidobacterium bifidus and Streptococcus thermophiles ( probiotics mixture) were studied against Staphylococcus aureus and Pseudomonas aeruginosa.The ethanolic precipitate of the probiotics mixture revealed antimicrobial activity against Staphylococcus aureus and assayed qualitatively by GC-Mass spectrum as it partially identified as carbohydrate substances, Antimicrobial activities of the used probiotics and prebiotics against S. aureus were studied in vitro referring to commercial used antibiotics, To investigate the protective efficiency of probiotics mixture and their prebiotics against S. aureus infection in mice, acomparative studies have been conducted and the success of treatment or prevention had been measured through detection of Liver enzymes (Aspartate transaminase (AST) and Alanin transaminase (ALT) , bacterial colony count in target organs (liver and lung ), histological changes occurred in liver and intestine and immunoglobulin IgM titer.In conclusion it could be concluded that the mixed culture of probiotic strains could increase the protective effects against S. aureus infection.

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3. Studies on the antibacterial effect of probiotics and prebiotics against Staphylococcus aureus and Pseudomonas aeruginosa.

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