Summary: The present study was undertaken to examine the genetic relationships among the closely related species, types A and B, and type C. These species were tested for DNA-DNA homology and thermostability of DNA duplexes and sorted into three genetically related groups: I, type A; II, type B, and one type C strain (Stockholm); III, the remaining type C strains. A few biochemical criteria corresponding to the genetic differences were recommended to differentiate each group. These studies imply that might be considered as type D and that there are two genetically different groups in type C.


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