TABLE 1.
Comparison of blood culture times to positivity by indicated grouping
| Grouping | No. of bottlesa | Time to positivity (h)b |
||||
|---|---|---|---|---|---|---|
| Mean | T50 | T90 | T95 | T99 | ||
| All | 13,592 | 21.1 | 16.5 | 38.5 | 56.5 | 103.5 |
| Aerobic bottles | 6,940 | 20.0 | 15.5 | 36.5 | 54.0 | 91.5 |
| Anaerobic bottles | 6,652 | 22.3 | 17.5 | 39.5 | 59.5 | 108.0 |
| Bottles from children | 823 | 20.0 | 16.5 | 36.0 | 44.0 | 84.0 |
| S. aureus | 3,893 | 18.4 | 16.0 | 29.5 | 39.0 | 72.0 |
| Coagulase-negative Staphylococcus spp.c | 2,208 | 23.5 | 20.5 | 35.5 | 46.0 | 86.5 |
| E. coli | 1,382 | 12.3 | 10.0 | 17.5 | 27.5 | 66.0 |
| S. epidermidis | 1,248 | 20.9 | 19.5 | 29.5 | 34.5 | 54.5 |
| E. faecium/E. faecalis | 859 | 15.7 | 13.0 | 25.5 | 34.5 | 64.5 |
| Candida spp. | 314 | 48.9 | 43.0 | 82.0 | 108.0 | 115.5 |
| P. aeruginosa | 298 | 22.2 | 16.0 | 45.0 | 57.5 | 96.0 |
| S. pneumoniae | 192 | 10.6 | 10.5 | 14.5 | 17.5 | 30.5 |
| Cutibacterium spp. | 121 | 103.9 | 106.0 | 115.5 | 118.0 | 118.0 |
| B. fragilis | 76 | 31.8 | 28.0 | 52.0 | 57.5 | 60.0 |
| S. maltophilia | 25 | 25.9 | 21.5 | 56.0 | 57.5 | 79.5 |
| No growth | 46 | 33.0 | 14.5 | 94.0 | 106.0 | 118.0 |
a
The total numbers of aerobic and anaerobic bottles were 7,113 and 6,804, respectively.
b
Times to achieve 50, 90, 95, and 99% of bottles positive are indicated as T50, T90, T95, and T99, respectively.
c
The “Coagulase-negative Staphylococcus spp.” grouping includes isolates not otherwise specified by row in the table.