A new species, , is proposed for avirulent strains of serotype 7, which is frequently isolated from tonsils of apparently healthy pigs. This species is morphologically and biochemically indistinguishable from the strains characterized to date. Seven strains of that belonged to serotype 7 were avirulent for swine, except for strain T-334, which induced a local urticarial lesion at the site of inoculation. The 50% lethal dose values in mice ranged from 1.0 CFU to 6.9 × 10CFU. The strains belonging to serotypes 2 (six strains), 6 (one strain), 11 (one strain), 12 (one strain), and 16 (one strain) induced generalized or local urticarial lesions after intradermal inoculation, except for strain T-312 of serotype 12, which showed 50% lethal dose values of ≤2.5 × 10 CFU in mice. The deoxyribonucleic acid base composition of is 36 to 40 mol% guanine plus cytosine. Strains of this species have little deoxyribonucleic acid homology (15 to 43%) with the type strain of (ATCC 19414). The type strain of is T-305(ATCC 43339).


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