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The deadly human typhoid agent was initially classified as a species called Salmonella typhi but later reclassified as a serovar of Salmonella enterica together with other pathogenically diverse serovars. The dynamic changes of Salmonella taxonomy reflect the need to clarify the phylogenetic status of the Salmonella serovars: are they discrete lineages or variants of a genetic lineage? To answer this...
A key issue troubling bacterial taxonomy and systematics is the lack of a biological species definition. Criteria to be used for defining bacterial species on genetic and biological bases should be able to reveal clear-cut boundaries among clusters of bacteria. To date, DNA–DNA re-association assays and ribosomal RNA sequence comparison have been useful in determining relative evolutionary distances...
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