The levels of cross-hybridization between deoxyribonucleic acids from , and unnamed taxon C were less than 15%. The levels of deoxyribonucleic acid complementarity between strains belonging to serovars 1 to 4 and polyacrylamide gel electrophoresis type I and II strains were very high (86 ± 7%), but the levels of complementarity between strain Nagasaki (serovar 5, polyacrylamide gel electrophoresis type II) and the remaining strains of were rather low (64 ± 5%). Our results indicate that, with the exception of serovar 5, the species comprises a rather homogeneous, genetically closely related group of bacteria. A further division of strains into subspecies according to their polyacrylamide gel electrophoresis peptide profiles is not justified on the basis of deoxyribonucleic acid sequence homologies. However, the taxonomic position of serovar 5 needs further investigation.


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