TABLE 1.
Inoculum counts performed on a single well of a broth microdilution plate
| Species (no. of strains) | Mean (105) CFU/ml (range)a on a:
|
|
|---|---|---|
| CDC plate | MicroScan plate | |
| S. epidermidis (27) | 1.78 (1.1–3.5) | 1.63 (0.6–3.6) |
| S. hominis (8) | 0.89 (0.3–2.1) | 0.92 (0.3–2.6) |
| S. warneri (6) | 1.60 (0.6–2.6) | 1.53 (0.6–3.6) |
| S. haemolyticus (3) | 1.34 (0.6–2.2) | 1.17 (0.2–2.7) |
| S. lugdunensis (2) | 4.43b (0.9–10.6) | 4.14b (0.9–12.1) |
| S. saprophyticus (2) | 2.57 (0.8–4.1) | 2.31 (0.7–5.1) |
| S. capitis (1) | 2.92 (0.98–5.4) | 2.58 (0.7–4.8) |
| S. simulans (1) | 2.02 (0.5–3.5) | 1.66 (0.2–3.2) |
a
The means represent the average counts from both MIC plates for each organism for each species counted in each laboratory. Each range consists of the mean from the laboratory with the lowest average counts per species and the mean from the laboratory with the highest average counts per species.
b
Counts within allowable range for final inoculum in MIC plates.