SUMMARY: In an attempt to elucidate the taxonomic relationship of and about sixty strains assigned to one or other of the two species were examined. Two groups of strains differing in their cultural and biochemical properties were recognized. One closely resembled the type culture of (Tissier & Martelly, 1902), and the other, in which some strains were pathogenic, resembled the isolate ‘82’ of Sordelli. The former of these groups is clearly to be regarded as and the latter as . It has been shown that the two species, although similar in many respects, are distinct and easily distinguishable. In view of this, the present practice of some bacteriologists of combining the two species under the name is incorrect and should be discontinued.


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