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MacConkey's Agar Images: Copyright FREE - P2
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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MacConkey's Agar growing E. coli, Enterobacter & Salmonella
(clockwise from top left plate).
MacConkey's Agar control plate growing E. coli (hot pink #5), & Salmonella (colorless #4). Staph epi and Staph aureus were also plated, but did not grow because Gram+.
MacConkey's Agar growing E. coli. Note pink color of bacteria due to lactose fermentation.
MacConkey's Agar growing Enterobacter. Note uneven pink color characteristic of a weak lactose fermenter.
MacConkey's Agar growing Salmonella. Note colorless growth due to the bacteria NOT being a fermenter.
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