SS AGAR (SALMONELLA SHIGELLA AGAR)

SS Agar medium is recommended as differential and selective medium for the isolation of Salmonella and Shigella
species from pathological specimens and suspected foodstuffs and for microbial limit test. SS Agar is a moderately selective medium in which gram-positive bacteria are inhibited by bile salts, brilliant green and sodium citrate.
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 centers.

for di?erential and selective isolation of Salmonella and Shigella species from pathological samples