Modified Salmonella Shigella Agar is a selective and differential medium widely used in sanitary bacteriology to isolate Salmonella and Shigella from feces, urine and fresh and canned foods. Modified Salmonella Shigella Agar is an improved formula of Salmonella Shigella Agar (SS Agar) (Cat.1064). Modified Salmonella Shigella Agar yields more Salmonellas and Shigellas and inhibits more Escherichia coli and Shigella sonnei colonies are pink, making the differentiation of Salmonella easier. Animal tissue peptic digest, Beef extract and Pancreatic digest of casein provide nitrogen, vitamins, minerals and amino acids essential for growth. Sodium thiosulfate and Ferric ammonium citrate allow the detection of the H2S producing bacteria such as some strains of Salmonella, as they produce colonies with black centers and a clear halo. Lactose and sucrose are the fermentable carbohydrates providing carbon and energy. Inhibition of Gram-positive microorganisms is obtained by the bile salts mixture. Bacteriological agar is the solidifying agent.
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