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September 9, 1974

Colonial Morphology Of Neisseria gonorrhoeae

Author Affiliations

Laboratory Centre for Disease Control Health and Welfare Canada Ottawa

JAMA. 1974;229(11):1422. doi:10.1001/jama.1974.03230490024012

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To the Editor.—  We have read recently with great interest the article by Brown and Kraus (228:862, 1974) regarding the recognition of the five colony types of Neisseria gonorrhoeae. The color photography truly enhances the morphological differences of the colony types.Our observations agree with those of Brown and Kraus, and we are happy that, for the first time, there has been a clear indication in the literature of dark and light types 1 and 2. We have previously found type 1 and 2 gonococci to have variants, and we have designated the lighter variants types la and 2a. Under our experimental conditions, each of the colony types 1, la, 2, and 2a has reproduced true to the characteristics of the original types, and was shown, therefore, to be a stable variant.Of interest to us, and not previously mentioned, is the fact that on prolonged incubation, types 1 and