Genus Hafnia
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus Hafnia,
- Hafnia alvei, Moller 1954.  In the past, Hafnia was considered a member of the genus Enterobacter and named Enterobacter hafniae,
Obesumbacterium proteus
biogroup 1 may be a synonym of Hafnia alvei hybridization group 1.
- Hafnia paralvei Huys et al. 2010, previously Hafnia alvei hybridization group 2.
Gram negative, straight, 1.0 x 2.0-5.0 μm, bipolar appearance bacilli. No capsule
produced. Motile by peritrichous flagella at 22-30 ºC, sometimes nonmotile strains.
Colonies are smooth (S type), low convex,  entire edge, gray, 2 mm diameter after 24h
incubation.
Facultatively anaerobic, optimum growth temperature 22 - 37 ºC. Grow on Nutrient
agar or nutrient broth, Trypticase Soy Agar ± 5% sheep blood, Mac Conkey, SS agar,
Drigalski, EMB agar.
Widely distributed in nature. Isolated from soil, water, dairy products and rarely from clinical specimens (feces) from humans & animals.
Hafnia alvei is an opportunistic pathogen. May cause nosocomial infections associated with other germs (septicaemia, enteritis,
urinary tract infections, pneumonia, absceses).
H. alvei has been associated with cases of diarrhoea (some strains of H.alvei-like are
now known as
Escherichia albertii ).
On animals may cause abortus, pneumonia, peritonitis or mammites. Has been associated with haemorrhagic septicemia of trout in
Bulgaria. May affect bees (bacteremia), especially those parasited with
Varooa jacobsoni.
Wort contaminant (brewery).
  1. J. G.Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9th-edition, Williams & Wilkins.
  2. Don J. Brenner and J.J. Farmer III, 2001. Family I. Enterobacteriaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second
    edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp 587-897.
  3. MJ Albert, K Alam, M Islam, J Montanaro, A S Rahaman, K Haider, M A Hossain, A K Kibriya, and S Tzipori Hafnia alvei, a probable
    cause of diarrhea in humans. Infect Immun. 1991 April; 59(4): 1507–1513.
  4. Kevin B Laupland, Deirdre L Church, Terry Ross and Johann DD Pitout: Population-based laboratory surveillance of Hafnia alvei
    isolates in a large Canadian health region. Annals of Clinical Microbiology and Antimicrobials 2006, 5:12
  5. Moller V. : Distribution of amino acid decarboxylases in Enterobacteriaceae. Acta Pathologica et Bacteriologica Scandinavica,
    1954, 35, 259-277.
  6. Geert Huys, Margo Cnockaert, Sharon L. Abbott, J. Michael Janda, and Peter Vandamme. Hafnia paralvei sp. nov., formerly known
    as Hafnia alvei hybridization group 2. Int J Syst Evol Microbiol August 2010 60:1725-1728.
Positive results for catalase, ONPG test, arginine dihydrolase, nitrate reduction, growth
on KCN media, Voges-Proskauer reaction, acid production from: glucose, D-mannitol,
rhamnose, L-arabinose, glycerol, maltose, D-mannose, trehalose & xylose.

Negative results for oxidase, lysine decarboxylase, ornithine decarboxylase, indole production, esculin hydrolysis, H
2S production,
citrate utilization, malonate utilization, acetate utilization, DN-ase, lipase, urease, phenilalanine deaminase, gelatinase, acid
production from: D-adonitol, D-arabitol, erythritol, lactose, myo-inositol, D-sorbitol, sucrose, melibiose, D-arabinose, cellobiose,
dulcitol, alpha-methyl-D-Glucoside, raffinose, salicin & mucate.

Hafnia paralvei can be separated from H. alvei by negative beta-glucosidase test, acid production from D-arabinose and no acid
production from: malonate & salicin.
(c) Costin Stoica
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