Comamonas (Pseudomonas) testosteroni
Taxonomy
Morphology
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References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pseudomonadales, Family Pseudomonadaceae, Genus Pseudomonas,
Pseudomonas testosteroni
 Marcus and Talalay 1956.
Moved to Class Betaproteobacteria, Order Burkholderiales, Family Comamonadaceae, Genus Comamonas,
Comamonas testosteroni
(Marcus and Talalay 1956) Tamaoka et al. 1987 emend. Willems et al. 1991.
Gram negative rods with polar flagella, 0.7-0.8 by 2.1-2.9 μm .
Obligately aerobic, 30 ºC (no growth at 4 or 41 ºC). No pigments are produced.
Can grow onTrypticase Soy Agar ± 5% sheep blood, Trypticase Soy Broth,  
Mueller-Hinton agar, Mac Conkey agar
Isolated from soil, rarely from clinical specimens.
Generally non-pathogenic bacteria. 1 case of human purulent meningitis, 1 case of bactermia due to a perforated appendicitis.
Sometimes isolated from animal specimens with doubtful clinical implication (admin note).
  1. R.E. Buchanan & N.E. Gibbons (co-editors): Bergey’s Manual of Determinative Bacteriology, eighth edition, 232.
  2. Marcus P.I. & Talalay P.: Induction and purification of α- and β-hydroxysteroid dehydrogenases. Journal of Biological
    Chemistry, 1956, 218, 661-674.
  3. Tamaoka J., Ha D.M. & Komagata K.: Reclassification of Pseudomonas acidovorans den Dooren de Jong 1926 and
    Pseudomonas testosteroni Marcus and Talalay 1956 as Comamonas acidovorans comb. nov. and Comamonas testosteroni
    comb. nov., with an emended description of the genus Comamonas. Int. J. Syst. Bacteriol., 1987, 37, 52-59.
  4. Willems A., Pot B., Falsen E., Vandamme P., Gillis M., Kersters K. & De Ley J.: Polyphasic taxonomic study of the emended
    genus Comamonas: relationship to Aquaspirillum aquaticum, E. Falsen group 10, and other clinical isolates. Int. J. Syst.
    Bacteriol., 1991, 41, 427-444.
  5. Arda B, Aydemir S, Yamazhan T, Hassan A, Tunger A, Serter D. Comamonas testosteroni meningitis in a patient with recurrent
    cholesteatoma. APMIS 2003;111:474-6.
  6. Gul Mustafa et al. Comamonas testosteroni bacteremia in a patient with perforated acute appendicitis. Short communication.
    Acta microbiologica et immunologica Hungarica 2007;54(3):317-21.
Can utilize for growth: testosterone, glycerol, gluconate, glycine, D-alanine, L-alanine ,
L-valine, DL-norvaline, L-leucine, L-isoleucine, L-norleucine, L-threonine,
L-phenylalanine, L-tyrosine, L-histidine, L-tryptophan, L-aspartate.

Cannot utilize glucose, m-erythritol, D-fructose, L-fucose, D-tagatose, m-inositol,
D-mannitol, 2-ketogluconate, 5-ketogluconate, amygdalin, beta-alanine,
DL-2-aminobutyrate, DL-norleucine, L-serine, L-methionine, D-tryptophan, L-arginine.
Nitrates reduction is variable, but nitrites reduction is negative.
(c) Costin Stoica
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