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In page Salmonella:

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In 1987, Le Minor and Popoff used molecular findings to argue that Salmonella consisted of only one species, S. enterica, turning former "species" names into serotypes.[2] In 1989, Reeves et al. proposed that the serotype V should remain its own species, resurrecting the name S. bongori.[3] The current (by 2005) nomenclature has thus taken shape, with six recognised subspecies under S. enterica: enterica (serotype I), salamae (serotype II), arizonae (IIIa), diarizonae (IIIb), houtenae (IV), and indica (VI).[4][5][6][7] As specialists in infectious disease are not familiar with the new nomenclature, the traditional nomenclature remains common.[citation needed]