Table 1 Growth, biochemical reactions, and results of antibiotic susceptibility tests for C. haemolyticum isolates
From: Chromobacterium haemolyticum-induced bacteremia in a healthy young man
| Â | Present case | Xan et al.[5] | |
|---|---|---|---|
Characteristic | C. haemolyticum | C. haemolyticum | C. violaceum |
Growth on agar (37°C, 5% CO2, 24 h): | Non-pigmented | Non-pigmented | Purple |
  Sheep blood | 2.3 mm, β-hemolysis | 2 mm, β-hemolysis | 2 mm, no hemolysis |
  Chocolate | 2.9 mm | 2 mm | 2 mm |
  Buffered charcoal yeast extract | NA | 2 mm, flat, dull | 2 mm, raised, shiny |
  Trypticase soy | 2.9 mm | 1.8 mm | 1 mm |
  MacConkey | NA | 0.2 mm, pinpoint | 1 mm |
  Hektoen enteric | NA | No growth | 0.2 mm, pinpoint |
Indole production (tryptophanase) | - | - | + |
Glucose fermentation | NA | + (weak) | + |
Utilization of: | Â | Â | Â |
  Mannose | - | - | + |
  Mannitol | + | + | - |
  Citrate | + | + | - |
  Oxidase | + | + | - |
  Catalase | - | + (weak) | + |
Antimicrobial susceptibility (MIC, μg/mL) |  |  |  |
  Amikacin | >32 | 16, S | 3, S |
  Cefepime | NA | >32, R | 2, S |
  Ceftriaxone | NA | >32, R | >32, R |
  Ciprofloxacin | <1 | 0.003, S | 0.006, S |
  Imipenem | 2 | 6.0, S | 1.0, S |
  Penicillin | NA | >32, R | >32, R |
  Piperacillin/tazobactam | NA | >256, R | 3, S |
  Ticarcillin/clavulanate | NA | >256, R | 32, I |
  Trimethoprim/sulfamethoxazole | NA | 0.094, S | 0.094, S |