XLD Agar is a selective and differential medium used in microbiology to isolate and differentiate enteric pathogens like Salmonella and Shigella. Its composition includes xylose as a fermentable sugar, lysine for differentiation, and sodium deoxycholate to inhibit non-enteric bacteria. Phenol red serves as a pH indicator, while ferric ammonium citrate indicates hydrogen sulfide production. Upon incubation, Salmonella typically produces black colonies with yellow centers, while Shigella forms red colonies. XLD Agar aids in diagnosing diseases caused by these pathogens.

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