Assessment of a selective medium for the isolation of Neisseria gonorrhoeae.

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Abstract
Specimens of urethral pus from 312 men with gonorrhea were diluted and inoculated on to non-selective and selective media, the latter containing vancomycin, colistin, nystatin and trimethoprim. Although 3 (1%) isolates of N. gonorrhoeae were inhibited by trimethoprim 4 mg/l and 10 by vancomycin 2 mg/l, only 2 strains failed to grow on a selective medium from large inocula but 8 strains sensitive to vancomycin failed to grow on a selective medium from a light inoculum. These few failures do not appear to negate the value of the selective medium.