SUMMARY: Deoxyribonucleic acid reassociation was used to assess divergence in species of Citrobacter and Citrobacter-like strains. Typical strains of were highly related. Antigenically atypical strains and most biochemically atypical strains showed a lower, but species level, of relatedness to typical Four additional relatedness groups were detected. One of these corresponded to , including A second contained A third group contained two indole strains which exhibited only 40 to 50% relatedness to other groups of Citrobacter. The fourth group contained HS, lysine organisms that are more closely related to than to


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