Forty-three strains of , one of and two of were studied using the comparative immunodiffusion technique. Three reference precipitation systems were employed: one represented N10, one ATCC 19247, and one ATCC 14629. One tight cluster was formed by the strains and another tight cluster was formed by some of the strains studied. However, other strains of were distinct from the latter cluster. Furthermore, ATCC 19247, which is the type strain, differed from most of the strains tested. Strains of the species and were found to be closely related, while strains differed slightly from this group. The strains referred to and were clearly distinct from the three reference strains; nevertheless, three antigens common to these genera were revealed.


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