Table 3 Profiles of isolated microorganisms in patients with pyogenic liver abscess
Characteristics | Total (n = 648) | Maximal size of abscess | P value | ||
|---|---|---|---|---|---|
< 5 cm (n = 293) | 5 ~ 10 cm (n = 312) | ≥ 10 cm (n = 43) | |||
Positive culture results | 326 (50.4) | 147 (50.2%) | 158 (50.8%) | 21 (48.8%) | 0.966 |
 Monomicrobial | 290 (44.8) | 131 (44.7) | 139 (44.6) | 20 (46.5) | 0.971 |
 Polymicrobial | 36 (5.6) | 16 (5.5) | 19 (6.1) | 1 (2.3) | 0.598 |
Isolated microorganisms | |||||
 Gram (−) organisms | |||||
  Klebsiella pneumoniae | 236 (36.4) | 106 (36.2) | 118 (37.8) | 12 (27.9) | 0.445 |
  Escherichia coli | 34 (5.2) | 16 (5.5) | 16 (5.1) | 2 (4.7) | 0.967 |
  Aeromonas species | 2 (0.3) | 1 (0.3) | 1 (0.3) | 0 (0.0) | 0.930 |
  Enterobacter species | 15 (2.3) | 8 (2.7) | 6 (1.9) | 1 (2.3) | 0.804 |
  Acinetobacter species | 2 (0.3) | 0 (0.0) | 2 (0.6) | 0 (0.0) | 0.340 |
  Pseudomonas species | 9 (1.4) | 4 (1.4) | 5 (1.6) | 0 (0.0) | 0.701 |
  Citrobacter species | 2 (0.3) | 0 (0.0) | 2 (0.6) | 0 (0.0) | 0.340 |
  Others | 6 (0.9) | 3 (1.0) | 2 (0.6) | 1 (2.3) | 0.542 |
 Gram (+) organisms | |||||
  Streptococcus species | 30 (4.6) | 13 (4.4) | 14 (4.5) | 3 (7.0) | 0.750 |
  Staphylococcus species | 20 (3.1) | 8 (2.7) | 9 (2.9) | 3 (7.0) | 0.310 |
  Enterococcus species | 7 (1.1) | 2 (0.7) | 5 (1.6) | 0 (0.0) | 0.427 |
  Clostridium species | 1 (0.2) | 1 (0.3) | 0 (0.0) | 0 (0.0) | 0.545 |
  Others | 3 (0.5) | 2 (0.7) | 1 (0.3) | 0 (0.0) | 0.725 |
 Fungus | 1 (0.2) | 0 (0.0) | 1 (0.3) | 0 (0.0) | – |