Colistin-oxolinic acid medium is proposed as a selective isolation medium for Gardnerella vaginalis. The medium is effective in inhibiting staphylococci and gram-negative bacteria while allowing growth of G. vaginalis.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC271795PMC
http://dx.doi.org/10.1128/jcm.21.5.843-.1985DOI Listing

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