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The oxidase test is used to determine whether an organism possesses the cytochrome c oxidase enzyme. The test is used as an aid for the differentiation of Neisseria, Moraxella, Campylobacter and Pasteurella species. It is also used to differentiate pseudomonads from related species.
Cronobacter is a genus of Gram-negative, facultatively anaerobic, oxidase-negative, catalase-positive, rod-shaped bacteria of the family Enterobacteriaceae. Several Cronobacter species are desiccation resistant and persistent in dry products such as powdered infant formula. They are generally motile, reduce nitrate, use citrate, hydrolyze esculin and arginine, and are positive for L-ornithine decarboxylation. Acid is produced from D-glucose, D-sucrose, D-raffinose, D-melibiose, D-cellobiose, D-mannitol, D-mannose, L-rhamnose, L-arabinose, D-trehalose, galacturonate and D-maltose. Cronobacter spp. are also generally positive for acetoin production and negative for the methyl red test, indicating 2,3-butanediol rather than mixed acid fermentation. The type species of the genus Cronobacter is Cronobacter sakazakii comb. nov.
Campylobacter concisus is a Gram-negative, highly fastidious, mesophilic bacterium that grows under both anaerobic and microaerobic conditions with the presence of hydrogen significantly aiding growth. Motile, with either unipolar or bipolar flagella, the organisms have a characteristic spiral/corkscrew appearance and are oxidase-positive. Although the human oral cavity is the natural colonization site of the bacterium, C. concisus may also colonize the intestinal tract of some individuals. In particular, several studies have reported higher intestinal prevalence of C. concisus in patients with IBD compared to healthy controls, which has led to current speculation of the bacterium's implication in the induction of Crohn's disease.
Vibrio furnissii is a Gram-negative, rod-shaped bacterium. Its type strain is ATCC 35016. V. furnissii is aerogenic (gas-producing), and uses L-rhamnose, L-arginine, L-arabinose, maltose, and D-mannitol, but not L-lysine, L-ornithine, or lactose. It has been isolated from patients with gastroenteritis, bacteremia, skin lesions, and sepsis.
Acinetobacter junii is a species of bacteria. Its type strain is ATCC 17908. It can be pathogenic. This bacterium has been linked to nosocomial infections including catheter-related blood stream infections and cellulitis.
Afipia felis is the type species of the Afipia bacterial genus. It was formerly thought to cause cat-scratch disease. It is a Gram-negative, oxidase-positive, nonfermentative rod in the alpha-2 subgroup of the class Proteobacteria. It is motile by means of a single flagellum. It is noted for having the longest authority citation of any accepted species.
Brucella anthropi is a bacterium. Before 2020 it was listed as Ochrobactrum anthropi. The type strain is strain CIP 82.115. B. anthropi strains are rod-shaped, aerobic, gram-negative, non-pigmented and motile by means of peritrichous flagella. One strain is able to break down Piracetam.
Acinetobacter ursingii is a species of potentially pathogenic bacteria. Its type strain is LUH 3792T.
Laribacter hongkongensis is a species of bacteria. It is facultatively anaerobic, non-sporulating, gram-negative, seagull- or spiral rod-shaped. It is a potential human pathogen. Laribacter hongkongensis has been isolated from human cases of diarrhea, but its role in causing diarrhea is unproven, even though it has been hypothesized. Additional studies are needed to better define its role as a possible enteric pathogen. These should include: case control studies designed to differentiate infection from colonization-transient passage, fulfilling Koch's postulates and Bradford-Hill's criteria on association vs. causation, possible virulence factors, animal models, host factors, antibody responses based on serodiagnostic testing, and human volunteer studies. The lessons learned from trying to establish the etiological role of the bacteria genera Aeromonas, Plesiomonas, and Edwardsiella in human diarrhea seem especially applicable for Laribacter. All four genera are isolated from extraintestinal infections, are apparently found in the aquatic environment, and epidemiological associations include eating fish and foreign travel. Even after over 50 years’ experience with the former three genera their etiological role in an individual case of human diarrhea is difficult to determine without extensive studies. For all four of these genera the critical issue will be differentiating infection from colonization or transient passage in the intestine.
Arcobacter cibarius is a species of Gram-negative, rod-shaped, slightly curved, non-spore-forming bacteria. LMG 21996T is its type strain.
Citrobacter gillenii is a species of Gram-negative bacteria.
Citrobacter murliniae is a species of bacteria.
Kluyvera ascorbata is a bacterium, the type species of its genus. It is Gram-negative, rod-shaped and motile with peritrichous flagella.
Helicobacter anseris is a bacterium in the Helicobacteraceae family, Campylobacterales order. It is Gram-negative, microaerophilic, spiral to curve-shaped, being first isolated from the faeces of geese.
Helicobacter brantae is a bacterium in the Helicobacteraceae family, Campylobacterales order. It is Gram-negative, microaerophilic, spiral to curve-shaped, being first isolated from the faeces of geese.
Rothia aeria is a Gram-positive bacterium.
Pseudoglutamicibacter cumminsii is a species of Gram-positive bacteria.
Methylorubrum zatmanii is a bacterium.
Rhinocladiella mackenziei is a deeply pigmented mold that is a common cause of human cerebral phaeohyphomycosis. Rhinocladiella mackenziei was believed to be endemic solely to the Middle East, due to the first cases of infection being limited to the region. However, cases of R. mackenziei infection are increasingly reported from regions outside the Middle East. This pathogen is unique in that the majority of cases have been reported from immunologically normal people.
Enterocloster citroniae, formerly Clostridium citroniae is a bacterium from the genus Enterocloster. The type species was isolated from a human infection in California in the United States.
References
- ↑ Farmer JJ, Fanning GR, Huntley-Carter GP, Holmes B, Hickman FW, Richard C, et al. (1981). "Kluyvera, a new (redefined) genus in the family Enterobacteriaceae: identification of Kluyvera ascorbata sp. nov. and Kluyvera cryocrescens sp. nov. in clinical specimens". J Clin Microbiol. 13 (5): 919–33. doi:10.1128/jcm.13.5.919-933.1981. PMC 273917 . PMID 7240403.
