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Pseudomonas aeruginosa

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Gram-negative, facultative anaerobes, coccobacillus bacteria which are turn out to be an opportunistic pathogens in animals and plants especially humans.


Pseudomonas aeruginosa are mostly found inwaters, soil and skin floras as well as in man-made environments thus, it thrives not only in normal air but also inhypoxic atmosphere that colonized natural and artificial surroundings.

Pseudomonas aeruginosa contains two kinds of metabolites such as the pyocyanin (blue) andpyoverdine (green) which describes as a blue-green characteristic pigments in laboratory cultures. When pyocyanin synthesized it forms biofilms that are a major cause of lungs cystic fibrosis in humans. It is also a common cause of dermatitis that lacks of proper attention to water quality and causes post-operatives infections inradial keratotomy surgery in humans. These organisms are also associated in skin lesion ecthyma gangrenosum and osteomyelitis in wound puncture of the foot.

In humans, Pseudomonas aeruginosa through its flexibility permits the organisms to infect damaged tissues or those havelower immunity thus, the indications of such infections are widespread inflammation and sepsis where if such colonization happens in critical body organs, such as kidneys, lungs and urinary tract will lead to a fatal outcome.

It uses organic matter for food, since the organisms flourish on moist surfaces this bacterium is also found on medical equipment like catheters that cause some cross-infection in hospitals.

Word Origin: pseudo= “false” + monas= “single unit” + ae= “old” + ruginosa= “wrinkled

Scientific Classification:

Kingdom: Bacteria

Phylum: Proteobacteria

Class: Gamma Proteobacteria

Order: Pseudomonadales

Family: Pseudomonadaceae

Genus: Pseudomonas

Species: Pseudomonas aeruginosa

See also:


facultative anearobes