Table 1. Pathogens isolated in 45 cases of polymicrobial bloodstream infection and 90 controls.
| Pathogens | Case (%), total n = 45 | Control (%), total n = 90 | Odds Ratio | P value |
| total microorganisms = 92 | ||||
| Gram-positive organism | 36/92 (39.1) | 54/90 (60) | 0.448 | 0.008 |
| Coagulase-negative Staphylococcus | 16/45 (35.6) | 37/90 (41.1) | 0.790 | 0.534 |
| Staphylococcus aureus | 8/45 (17.8) | 11/90 (12.2) | 1.553 | 0.384 |
| Enterococcus species | 11/45 (24.4) | 4/90 (4.4) | 6.956 | 0.002 |
| Group-B streptococcus | 0/45 (0) | 2/90 (2.2) | NA | - |
| Others | 1/45 (2.2) | 0/90 (0) | NA | - |
| Gram-negative organism | 55/92 (59.8) | 31/90 (34.4) | 2.829 | <0.001 |
| Klebsiella spp. | 16/45 (35.6) | 11/90 (12.2) | 3.962 | 0.002 |
| Escherichia coli | 11/45 (24.4) | 8/90 (8.8) | 3.316 | 0.018 |
| Enterobacter spp. | 14/45 (31.1) | 4/90 (4.4) | 9.710 | <0.001 |
| Pseudomonas aeruginosa | 1/45 (2.2) | 2/90 (2.2) | NA | 1.000 |
| Acinetobacter baumannii | 6/45 (13.3) | 4/90 (4.4) | 3.308 | 0.076 |
| Serratia marcescens | 2/45 (4.4) | 1/90 (1.1) | 4.140 | 0.251 |
| Others* | 5/45 (11.1) | 1/90 (1.1) | 11.125 | 0.030 |
| ESBL-producing bacteria | 7/45 (15.6) | 4/90 (4.4) | 3.961 | 0.036 |
| Fungus | 1/45 (2.2) | 5/90 (5.6) | 0.386 | 0.392 |
ESBL: extended-spectrum β-lactamase, NA: not assayed.
Including Citrobacter freundii (2), Stenotrophomonas maltophilia (1), Morganella morganii (1), and Preteus mirabilis (1) in the case episodes.