Table 3.
The microbiological features of the isolates in patients with true infection and contamination
| Total (n = 312) | True infection (n = 49) | Contamination (n = 263) | P for differencea | |
|---|---|---|---|---|
| Two or more positive blood cultures | 29 (9.3).b | 18 (37) | 11 (4.2) | < 0.001 |
| Polymicrobial | 47 (15) | 8 (16) | 39 (15) | 0.79 |
| TTPc (IQR.d) | 105 (96–114) | 100 (83–109) | 106 (97–115) | 0.002 |
| Species of Cutibacterium, n (%) | ||||
| C. acnes | 275 (88) | 44 (90) | 231 (88) | |
| C. avidum | 3 (1.0) | 1 (2.0) | 2 (0.8) | |
| C. granulosum | 3 (1.0) | 0 | 3 (1.1) | |
| Not determined to species | 31 (10) | 4 (8.2) | 27 (10) | |
aPearson’s chi-squared and Mann–Whitney U test was performed to compare the groups. bEpisode numbers and percent. cTime to blood culture positivity in hours. dInterquartile range