XLD Agar

Originally introduced as an aid to recovery of Shigella spp. XLD is also a first class medium for recovery of Salmonella spp. It differs from other media of this type in that it has less Sodium Desoxycholate as its selective agent. The indicator system is somewhat complex taking advantage of the fermentation or otherwise of three carbohydrates (Lactose Sucrose and Xylose) together with Lysine Decarboxylase and Sodium Thiosulphate as an indication of the presence or absence of Hydrogen Sulphide.

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Organisms Ref. No Result
Salmonella typhimurium NCTC 12023 Translucent colonies with black centre
Enterococcus faecalis NCTC 12697 Inhibited
Escherichia coli NCTC 12241 Inhibited
Shigella sonnei NCTC 8574 Red colonies