Salmonella enterica
Bacteria of the genus Salmonella are Gram-negative, facultatively anaerobic, non-spore forming, usually motile rods belonging to the family Enterobacteriaceae and primarily associated with animals. The genus currently contains just two species, Salmonella enterica (including six subspecies) and Salmonella bongori. Most of the Salmonella isolates from cases of human infection belong to Salmonella enterica subspecies enterica. The genus is also further subdivided into approximately 2,500 serovars (or serotypes), characterised on the basis of their somatic (O) and flagellar (H) antigens.