Since the publication of the Approved Lists of Bacterial Names, the type species of the genus has been . At the time of publication of the Approved Lists, five species had standing in the nomenclature, and the description of was the same as that of the serotype of that name. Several studies have shown that the genus consists of only one species, and the strict application of the Bacteriological Code would recognize (the type species) as the single species. This can lead to confusion and hazards since the specific epithet is also the name of a serovar (serovar ). This confusion is increased by the common practice of using serovar names as if they represented species names (e.g., , and ). Some serovars (e.g., subsp. serovar Typhi) are highly pathogenic and cause a disease different from that caused by other serovars (e.g. subsp. serovar Choleraesuis). To avoid further confusion, it is proposed to use for the single species a name which has not been used earlier for a serotype. It is thus requested that the type species of the genus be sp. nov., nom. rev. with strain CIP 60.62 (a HS-producing clone of strain LT2) as the type strain. Since the name is not proposed for rejection, bacteriologists who do not accept the single species concept of the genus will be free to use the name as a synonym of subsp. serotype Choleraesuis.


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