The mean base compositions of DNA from 27 strains of and ranged from 43.4 to 53.2 mol % GC with genome sizes from 3.04 x 10 to 4.23 x 10 daltons. On the basis of DNA-DNA binding, estimated spectrophotometrically from initial renaturation rates, strains were heterogeneous in the extent to which they shared similar nucleotide sequences, and were divided into four DNA homology groups. The DNA characteristics of strains in these groups correlated with several biochemical characteristics that facilitated identification of clinical isolates of The two species and appear to be synonymous and none of the four groups of was related in DNA sequences to should therefore be retained as a single species and characteristics for identifying the various groups within the species are listed.


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