Abstract

Quantitative micro complement fixation and double diffusion tests were performed with extracts from selected Neisseria species, using antisera against NADP‐dependent glutamate dehydrogenase from N. meningitidis and malate dehydrogenase from N. perflava. N. catarrhalis, N. ovis and N. caviae did not react with any serum. Within the “true neisserias” no distinct differences in reactivity were noted using anti‐malate dehydrogenase serum. With anti‐glutamate dehydrogenase serum these species separated in 4 groups with decreasing similarity to N. meningitidis: I. N. meningitidis, N. gonorrhoeae, N. lactamica, N. flavescens, N. cinerea; II. N. sicca, N. perflava, N. flava, N. subflava; III. N. mucosa; and IV. N. elongata.

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