Strains of and were characterized by deoxyribonucleic acid (DNA) hybridization, and the extent of DNA relatedness between the strains was assessed by hydroxyapatite chromatography. DNAs from 24 strains of were highly related, but was only 40 to 60% related to strains formed three DNA relatedness groups, and the data strongly suggest a fourth relatedness group. Each relatedness group can be defined biochemically. One DNA relatedness group corresponds to typical ; the second is rhamnose positive; the third is rhamnose positive, melibiose positive, α-methyl glucoside positive, and raffinose positive. The suggested fourth hybridization group is sucrose negative. Although all of these DNA relatedness groups should remain in the genus , only the first group is All of the yersiniae tested are distantly, but significantly, related to other members of Yersiniae were more related to members of than to


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