Staphylococcus epidermidis Growing on Columbia CNA Agar

Only Gram-positive bacteria grow on Columbia CNA agar. (Gram-negative bacteria are inhibited by the colistin and nalidixic acid added to the agar.) Staphylococcus epidermidis does not normally produce pigment.
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Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
is licensed under a Creative Commons Attribution 4.0 International License.
Last updated: August, 2017