Mac Conkey Agar

Escherichia coli: Mac conkey agar

peptone base with lactose. Gram positive organism inhibited by crystal violet and bile salts. neutral ed as indicator

(HE) Hektoen Enteric agar

Peptone base agar with bile salts, lactose, sucrose, salicin, and ferric ammonium citrate.indicators include bromthymol blue and acid fuchsin.

(XLD) agar=yeast extract agar with lysine, xylose, lactose, sucrose, and ferric ammonium citrate, sodium desoxychocolate inhibits gram positive organism ; phenol red as indicator

*page 96-96

LF: flat,dry,pink colonies with a surrounding darker pink area of precipitated bile salts

yellow

yellow

*page 328

Source:Forbes, B., Shan, D., & Weissfeld, A. Baileys and Scott's

Diagnostic Microbiology (12th ed). Philippines: Elsevier.