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HafniaRANK: GenusTAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Gammaproteobacteria -> Enterobacteriales -> Enterobacteriaceae -> Hafnia OVERVIEW: Straight rods, ~1.0 × 2.0–5.0 µm, conforming to the general definition of the family Enterobacteriaceae. Not encapsulated. Gram negative. Motile by peritrichous flagella at 30°C, but nonmotile strains may occur. Facultatively anaerobic. Oxidase negative. Catalase positive. The majority of strains utilize citrate as a sole carbon source at 30°C after 3–4 d of incubation. Nitrate is reduced to nitrite. H2S is not produced in the butt of Kligler iron agar. Gelatinase, lipase, and deoxyribonuclease are not produced. Alginate is not utilized. Pectate is not decomposed. Phenylalanine deaminase is not produced. Lysine and ornithine decarboxylase tests are positive, but the arginine dihydrolase test is negative. d-Glucose is fermented with the production of acid and gas. Acid is not produced from d-sorbitol, raffinose, melibiose, d-adonitol, d-arabitol, and myo-inositol. The methyl red test is usually positive at 35°C and negative at 22°C. Acetylmethylcarbinol is usually produced from d-glucose at 22–28°C but may not be produced at 35°C. Occur in the feces of humans and a wide range of animals including birds; also occur in sewage, soil, water, and dairy products. A member of the Gammaproteobacteria.The mol% G + C of the DNA is: 48–49. Type species: Hafnia alvei This genus contains microbial species that can reside in the human gastrointestinal tract. [PMC 4262072]
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