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XLD Agar is the complete Xylose Lysine Desoxycholate Agar, a moderately selective medium recommended for isolation and differentiation of enteric pathogens, especially Shigella species.

XLD Agar is a selective and differential medium used for the isolation and differentiation of enteric pathogens from clinical specimens. The value of XLD Agar in the clinical laboratory is that the medium is more supportive of fastidious enteric organisms such as Shigella.

XLD Agar is both a selective and differential medium. It utilizes sodium desoxycholate as the selective agent and, therefore, it is inhibitory to gram-positive microorganisms.