Used in microbiology laboratories as a selective and differential culture medium for the isolation and identification of *Salmonella* and *Shigella* species from clinical and non-clinical samples. Supports the growth of enteric pathogens while inhibiting gram-positive bacteria and commensal flora due to bile salts and selective agents. Lactose fermentation and hydrogen sulfide production can be observed through color changes in the medium, aiding in differentiation of bacterial colonies. Commonly used in food safety testing, water analysis, and clinical stool sample examination.