A DNA probe specific for all four serogroups of Erwinia carotovora subsp. atroseptica was selected from an EcoRI digest of a cloned library constructed with the combined genomic DNA from strains 6, 31, 196, and 198, which each represented one of the serogroups of E. c. atroseptica. Specificity of the probe was initially tested against a panel of 40 E. carotovora strains representing serogroups I through XL. Subseguently hybridization of the probe, labeled with digoxigenin, was tested against an additional 82 strains of E. corotovora. The probe hybridized to all strains previously identified as E. c. atroseptica on the basis of biochemical and physiological tests, and it hybridized weakly with only one strain that was not a typical E. c. atroseptica strain [...]
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L. J. Ward (1994) studied this question.