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Pseudomonas
The bacterial genus Pseudomonas includes plant pathogenic bacteria
such as P. syringae (various patovars), the human pathogen P.
aeruginosa, and some species that are known to cause problems in dairy
products. However, the actions of this group of bacteria are mainly
considered as beneficial or neutral to man. In recent times, members
of the Pseudomonas have been used as biocontrol agents.
Pseudomonas aeruginosa
Found in the soil, sweage and water. Some are commensals in the
intestine, others cause urinary tract infection, wound infection and
otitis media. The organism is highly resistant to antibiotics and
causes chronic infections specially in debiliated, old and
hospitalized patients with low defence mechanisms.
Morphology
Gram negative motile bacilli.
Cultural characteristics
They are aerobes that grow on nutrient agar leading to greenish
discoloration of the medium due to its diffusible exopigment which
consists of pyocyanin (blue green) and fluorescein (yellow).
Biochemical characteristics
Oxidase positive and does not ferment any sugar.
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