![]() Alterations to the bile salt mixture, peptone and pH value considerably improve the growth of shigellae without too much increased growth of commensal organisms. Although widely used, traditional SS Agar has been criticized because of excessive inhibition of Shigella species. Our formulation of Salmonella Shigella Agar (SS Agar) has been modified from the original for improved performance. The sensitivity and selectivity of XLD Agar exceeds that of the traditional plating media, e.g., Eosin Methylene Blue and Bismuth Sulphite agars, which tend to suppress the growth of shigellae. Widely recognised in international standards, XLD Agar, relies on xylose fermentation, lysine decarboxylation and production of hydrogen sulphide for the primary differentiation of Shigella and Salmonella spp.
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