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International Journal of Systematic and Evolutionary Microbiology, Vol 51, 901-904, Copyright © 2001 by Society for General Microbiology

Phylogenetic positions of Clostridium novyi and Clostridium haemolyticum based on 16S rDNA sequences

Y Sasaki, N Takikawa, A Kojima, M Norimatsu, S Suzuki and Y Tamura
National Veterinary Assay Laboratory, 1-15-1, Tokura, Kokubunji, Tokyo 185-8511, Japan

The partial sequences (1465 bp) of the 16S rDNA of Clostridium novyi types A, B and C and Clostridium haemolyticum were determined. C. novyi types A, B and C and C. haemolyticum clustered with Clostridium botulinum types C and D. Moreover, the 16S rDNA sequences of C. novyi type B strains and C. haemolyticum strains were completely identical; they differed by 1 bp (level of similarity >99.9%) from that of C. novyi type C, they were 98.7% homologous to that of C. novyi type A (relative positions 28--1520 of the Escherichia coli 16S rDNA sequence) and they exhibited a higher similarity to the 16S rDNA sequence of C. botulinum types D and C than to that of C. novyi type A. These results suggest that C. novyi types B and C and C. haemolyticum may be one independent species generated from the same phylogenetic origin.




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