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Salmonella-Shigella (SS) Agar
Salmonella-Shigella (SS) agar is used for the isolation of Salmonellae and Shigellae in fecal material. It can also be used as a second media of isolation in the context of standardized methods for the detection of Salmonella.
Available as dehydrated medium : 500 g bottle
In compliance with regulatory requirements, a USDA permit (VS 16-3) is mandatory for shipments from Canada to the USA due to the inclusion of peptone, an animal byproduct.
SS Agar is a moderately selective medium in which Gram-positive bacteria are inhibited by bile salts, brilliant green and sodium citrate.
The high concentrations of citrate and sodium thiosulfate limit the development of coliform bacteria and prevent the invasion of the medium by Proteus.
Fermentation of lactose to acid is revealed by the formation of red colonies in the presence of neutral red. Lactose- negative bacteria form colorless colonies.
In the presence of thiosulfate and ferric citrate, hydrogen sulfide producers form colonies with a black center
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