SS Agar (Salmonella Shigella Agar) Plate - HiMedia Laboratories

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SS Agar (Salmonella Shigella Agar) Plate - HiMedia Laboratories
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SS Agar (Salmonella Shigella Agar) Plate - HiMedia

SS Agar (Salmonella Shigella Agar) Plate For differntial and selective isolation of Salmonella and Shigella species from pathological speciemens, suspected foodstuffs etc. Composition** Ingredients Gms / Litre Peptic digest of animal tissue 15.000 Proteose peptone 5.000 Dextrose 1.000 Lead acetate 0.200 Sodium thiosulphate 0.080 Agar 15.000 Final pH ( at 25°C) 7.0±0.2 **Formula adjusted, standardized to suit performance parameters Directions Either streak, inoculate or surface spread the test inoculum (50-100 CFU) aseptically on the plate. Principle And Interpretation Please refer disclaimer Overleaf. MP108 SS Agar medium is recommended as differential and selective medium for the isolation of Salmonella and Shigella species from pathological specimens (1) and suspected foodstuffs (2, 3, 4, 5) and For microbial limit test (6). SS Agar is a moderately selective medium in which gram-positive bacteria are inhibited by bile salts, brilliant green and sodium citrate. Peptic digest of animal tissue, beef extract provide essential growth nutrients. Lactose is the fermentable carbohydrate. Brilliant green, bile salts and thiosulphate selectively inhibit gram-positive and coliform organisms. Sodium thiosulphate is reduced by certain species of enteric organisms to sulphite and H2S gas and this reductive enzyme process is attributed by thiosulphate reductase. Production of H2S gas is detected as an insoluble black precipitate of ferrous sulphide, formed upon reaction of H2S with ferric ions or ferric citrate, indicated in the centre of the colonies. The high selectivity of Salmonella Shigella Agar allows the use of large inocula directly from faeces, rectal swabs or other materials suspected of containing pathogenic enteric bacilli. On fermentation of lactose by few lactose-fermenting normal intestinal flora, acid is produced which is indicated by change of colour from yellow to red by the pH indicator-neutral red. Thus these organisms grow as red pigmented colonies. Lactose non-fermenting organisms grow as translucent colourless colonies with or without black centres. Growth of Salmonella species is uninhibited and appears as colourless colonies with black centres resulting from H2S production. Shigella species also grow as colourless colonies which do not produce H2S. It is recommended to inoculate plates of less inhibitory media parallel to SS Agar, such as Hektoen Enteric Agar (M467) or Deoxycholate Citrate Agar (M065) for easier isolation of Shigella species (7). Quality Control Appearance Sterile Salmonella Shigella Agar in 90mm disposable plate. Colour Reddish orange coloured medium. Quantity of Medium 25ml of medium in 90mm plate. Reaction 6.80- 7.20 Cultural response Cultural characteristics observed after incubation at 35-37°C for 18 - 48 hours.

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