Use RAPID'E.coli 2 Agar for the identification and enumeration of generic E. coli and other coliforms in products intended for human or animal consumption, or in environmental samples. RAPID'E.coli 2 Medium uses two chromogenic color reactions, β-D-galactosidase (GAL) and β-D-glucuronidase (GLUC), for the clear identification of E. coli and other coliforms. Features and Benefits Direct enumeration of E. coli and coliforms on a single plate Coliforms are GAL+/GLUC- and form blue to green colonies E. coli is GAL+/GLUC+ and forms violet to pink colonies Results in 24 hr Note: There are a few β-D-glucuronidase-negative strains of E. coli, e.g., E. coli O157. Some serovars of Salmonella and a few species of Shigella possess the enzyme β-D glucuronidase (< 1.5%).="" validations="" certified="" nf="" validation="" according="" to="" the="" iso="" 16140="" standard="" and="" validated="" by="" the="">