Journal List > Yonsei Med J > v.19(1) > 1028099

Chong, Kim, and Lee: Modified Dextrose Starch Agar for the Preservation of Neisseria gonorrhoeae

Abstract

To seek a practical and inexpensive method to preserve gonococcal cultures, a few methods were compared. The following methods kept the cultures alive for only a short period of time: skim milk at -20℃; tryptic soy broth with 15% glycerol at -20℃; cystine tryptic agar at 35℃. Most of the test cultures survived for more than 4 weeks in the following media: one half strength dextrose starch agar; one half strength dextrose starch agar with ferric nitrate; one half strength dextrose starch agar with antimicrobic CNV. Dextrose starch agar could be substituted by GC medium base with a slight modification. It is concluded that preservation of gonococci in one half strength dextrose starch agar with CNV, which produces less frequent contamination, is a practical method to maintain cultures for teaching and quality control.

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