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colourized scanning electron micrograph (SEM) of some Pseudomonas aeruginosa
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Pseudomonadales
Family: Pseudomonadaceae
Genus: Pseudomonas
Type species
Pseudomonas aeruginosa

Pseudomonas is a genus of gammaproteobacteria. They are in the family of pseudomonads. Pseudomonas bacteria can be found in many different environments, such as soil, water, and plant and animal tissue.

There are many Pseudomonas species. Some are parasitic and invade animal tissues. In humans, pathogenic Pseudomonas thrive, especially after antibiotic treatment: once they are able to multiply rapidly they can be harmful.

Pseudomonas sp. growing on an agar plate