Differential characters of hemolytic Acinetobacter species:
Legend: + positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pseudomonadales, Family Moraxellaceae, Genus Acinetobacter,
Acinetobacter gyllenbergii Nemec et al. 2009.
Gram-negative coccobacilli. Nonmotile. Nonsporulated.
Colonies on tryptone soya agar after 24 h incubation at 30 ºC are approximately 1.0-
2.0 mm in diameter, circular, convex, smooth and slightly opaque with entire margins.
Growth occurs at 25-37 ºC, but not at 41 ºC. Weak growth of some strains occurs at
37 ºC. Strictly aerobic. Hemolytic; produce large zones of hemolysis after 24 h on
Columbia agar supplemented with sheep or horse blood.
Isolated from human clinical specimens (blood, urine, sputum, vaginal swab, throat swab).
Undetermined. Isolated from clinical samples.
- Alexandr Nemec, Martin Musílek, Martina Maixnerová, Thierry De Baere, Tanny J. K. van der Reijden, Mario Vaneechoutte, and
Lenie Dijkshoorn. Acinetobacter beijerinckii sp. nov. and Acinetobacter gyllenbergii sp. nov., haemolytic organisms isolated from
humans . Int J Syst Evol Microbiol January 2009 59:118-124.
Positive results for catalase, gelatinase, utilization of: acetate, citrate (Simmons’),
DL-lactate, azelate, beta-alanine, L-histidine, D-malate, phenylacetate, L-arginine,
L-leucine, benzoate & adipate.
Negative results for oxidase, utilization of: transaconitate, L-aspartate, histamine, levulinate, citraconate, L-tartrate, D-glucose, D-
gluconate, D-ribose, L-arabinose, 2,3-butanediol, tryptamine, trigonelline, tricarballylate & putrescine.
Variable results for utilization of: malonate, L-phenylalanine, 4-hydroxybenzoate, ethanol & L-ornithine.
(c) Costin Stoica