f Neisseria elongata sp.nov., a Rod-shaped Member of the Genus Neisseria. Re-evaluation of Cell Shape as a Criterion in Classification
- Authors: K. BØVRE, E. HOLTEN
- First Published Online: 01 January 1970, Microbiology 60: 67-75, doi: 10.1099/00221287-60-1-67
- Subject: Article
- Issue Published:
SUMMARY: A rod-shaped, non-motile, Gram-negative, oxidase-positive and asaccharolytic organism found in the human nasopharynx is allotted to genus Neisseria and named Neisseria elongata. The strain M 2, which is the only isolate, is proposed as the type strain. The average guanine + cytosine (G + C) content of its DNA is 53 mole %. Genetic transformation of streptomycin resistance reveals a comparatively high compatibility with N. meningitidis and a strain designated N. flava, with ratios of interstrain to autologous transformation frequency in the range 0·01 to 0·1. On the other hand, there is no affinity in streptomycin-resistance transformation between N. elongata and members of genus Moraxella, including the old concepts N. catarrhalis and N. ovis. The family Neisseriaceae now appears to consist of two genera, Neisseria and Moraxella, each containing both coccal and rod-shaped species, which makes cell shape questionable as a highly weighted criterion in the construction of bacterial genera and higher taxa.
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