Public
health England has issued “UK Standards for Microbiology Investigations ID 24:
identification of Salmonella species.”
There
are currently 2 validly published species and 6 subspecies. They are Salmonella bongori, Salmonella enterica
and its subspecies - Salmonella enterica
subspecies arizonae, Salmonella enterica subspecies diarizonae, Salmonella
enterica subspecies enterica, Salmonella enterica subspecies houtenae,
Salmonella enterica subspecies indica and Salmonella enterica subspecies
salamae.
Cells
are rod-shaped, non-spore-forming, and predominantly motile by means of
peritrichous flagella with diameters of around 0.7-1.5μm and lengths of 2-5μm
with a few exceptions. On blood agar, colonies are 2-3mm in diameter. Colonies
are generally lactose non-fermenters. They obtain their energy from oxidation
and reduction reactions using organic sources, and are facultative anaerobes.
They produce acid from glucose usually with the production of gas, and are
oxidase negative.
Posted by Tim Sandle
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