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Proteus penneri is a Gram-negative, facultatively anaerobic, rod-shaped bacterium. [1] It is an invasive pathogen [2] and a cause of nosocomial infections of the urinary tract or open wounds. [3] Pathogens have been isolated mainly from the urine of patients with abnormalities in the urinary tract, and from stool. [4]
Prevotella melaninogenica are Gram-negative rod-shaped bacteria. They cannot survive in the presence of oxygen. They are not motile, and do not form spores. P. melaninogenica grow well on blood agar, where they form circular dark-colored colonies that darken over one to two weeks.
Citrobacter koseri, formerly known as Citrobacter diversus, is a Gram-negative non-spore forming, rod-shaped bacterium. It is a facultative anaerobe capable of aerobic respiration. It is motile via peritrichous flagella. [2] It is a member of the family of Enterobacteriaceae.
Enterobacter cloacae is a member of the normal gut flora of many humans and is not usually a primary pathogen. [9] Some strains have been associated with urinary tract and respiratory tract infections in immunocompromised individuals.
Proteus mirabilis appears as Gram-negative rods after Gram staining under bright-field microscopy with 1000 times magnification. Proteus mirabilis is a Gram-negative, facultatively anaerobic, rod-shaped bacterium. It shows swarming motility and urease activity. P. mirabilis causes 90% of all Proteus infections in humans.
Klebsiella aerogenes, [2] previously known as Enterobacter aerogenes, is a Gram-negative, oxidase-negative, catalase-positive, citrate-positive, indole-negative, rod-shaped bacterium. [3] Capable of motility via peritrichous flagella, [ 4 ] it is approximately one to three microns in length.
Klebsiella oxytoca on agar plate. Klebsiella oxytoca is a Gram-negative, rod-shaped bacterium that is closely related to K. pneumoniae, from which it is distinguished by being indole-positive; it also has slightly different growth characteristics in that it is able to grow on melezitose, but not 3-hydroxybutyrate.
Aeromonas veronii is a Gram-negative, rod-shaped bacterium found in fresh water and in association with animals. [2] In humans A. veronii can cause diseases ranging from wound infections and diarrhea to sepsis in immunocompromised patients.