Pseudomonas species - Overview

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Phylum Proteobacteria
Class Gamma Proteobacteria
Order Pseudomonadales
Family Pseudomonadaceae
Genus Pseudomonas

Scanning electron micrograph (SEM) of a number of Pseudomonas aeruginosa bacteria.( Janice Haney Carr 2008, Wikimedia commons)

The Pseudomonas species are Gram-negative rods. They are obligate aerobes and are oxidase and catalase positive.

The Pseudomonas species are motile by polar flagellae and cause opportunistic infections. Most Pseudomonas species are resistant to antibiotics due to their efflux pumps, which pump out the antibiotics before they can act. They contain porins in their cell wall that allows them to survive harsh conditions.


Krieg, Noel (1984). Bergey's Manual of Systematic Bacteriology, Volume 1. Baltimore: Williams & Wilkins.

See here for a list of Pseudomonas species

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