Gilardi, Gerald L. Microbiology Laboratory, North General Hospital, New York, New York.
Last reviewed:December 2018
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A genus of Gram-negative, non-spore-forming, rod-shaped bacteria. Pseudomonas is a heterogeneous taxon of bacteria; division at the genus level has been revised often, and numerous species formerly belonging to Pseudomonas have been transferred to other genera (for example, Burkholderia, Stenotrophomonas, Xanthomonas, and Aeromonas). Pseudomonas bacteria (often termed pseudomonads) are notable because some of them are responsible for a number of infectious diseases in animals (including humans) and plants. In particular, these bacteria are opportunistic pathogens (that is, they cause disease only when the host's immune system is impaired). The type species is P. aeruginosa (see illustration). See also: Bacteria; Bacterial physiology and metabolism; Bacterial taxonomy; Bacteriology; Infectious disease; Medical bacteriology; Opportunistic infections; Stain (microbiology)
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