MacConkey's Agar showing lactose positive pink colony above a lactose negative colorless colony.
MacConkey's Agar growing a pink smiley face of E. coli.
Page last updated 8/2015
MacConkeys (back) & TSY agar (front) growing environmental sample from kitchen sink.
Unknown bacteria plated on Mannitol Salt Agar (left) and MacConkey's (right). Note that there is no growth on MacConkey's. So what do you think the unknown bacterium is?
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