Question

MacConkey Agar What is it used for?How does it work?

Accepted Answer

Isolate gram (-) organisms↓ Ferments lactose on MacConkey agar↓ Decreased ↓pH causes color change (pink-red)  Bile salts present in MacConkey agar prevent the growth of gram (+) organisms so growth on CSF MacConkey' culture implies a CNS infection with enteric bacteria (E.coli)

Front	MacConkey Agar What is it used for? How does it work?
Back	Isolate gram (-) organisms ↓ Ferments lactose on MacConkey agar ↓ Decreased ↓pH causes color change (pink-red) Bile salts present in MacConkey agar prevent the growth of gram (+) organisms so growth on CSF MacConkey' culture implies a CNS infection with enteric bacteria (E.coli)

Macconkey Gram Organisms Agar Growth Agar Work Isolate