This HiDip slides are recommended for urine bacteria and Enterococci screening. MacConkey Agar - A selective medium for detection of Enterobacteriaceae and is based on lactose fermentation with neutral red as indicator. Sodium taurocholate is the selective agent. CLED Agar- A non-selective agar based on lactose fermentation with Bromothymol blue, BTB as indicator. Bile Esculin Agar - A specific medium for Enterococci based on esculin hydrolysis.