TABLE 3.
Results of testing K. pneumoniae (WHO-1)
| Antimicrobial agent (no. of labs that tested)a | Reference result (interpretive category)
|
No. of labs reporting disk diffusion results (range of zone diameters in mm)
|
No. of labs reporting MIC results (range of MICs in μg/ml)
|
|||||
|---|---|---|---|---|---|---|---|---|
| MIC in μg/ml | Disk zone diameter in mm | S | I | R | S | I | R | |
| Aztreonam (9) | 32 (R) | 16 (I) | 3 (28–32) | 1 (20)b | 0 | 0 | 1 (16) | 4 (>16–>32) |
| Cefazolin (74) | >32 (R) | 7 (R) | 0 | 0 | 24 (6–14) | 0 | 0 | 50 (>16–>128) |
| Cefotaxime (92) | >64 (R) | 12 (R) | 6 (28–34) | 18 (15–22)bc | 32 (6–14) | 6 (4–8) | 8 (16–32)d | 22 (>32) |
| Ceftriaxone (16) | >64 (R) | 12 (R) | 3 (27–32) | 0 | 13 (6–13)e | 0 | 0 | 0 |
| Ceftazidime (105) | 128 (R) | 11 (R) | 9 (18–30)d | 4 (15–17)f | 57 (6–14) | 0 | 4 (16)d | 31 (>16–>32) |
| Cephalothin (45) | 6 (R) | 5 (18–22) | 2 (15–16) | 35 (6–14) | 0 | 0 | 3 (32–>256) | |
a
Labs returning results, 130.
b
One incorrectly called susceptible.
c
Seven incorrectly called resistant.
d
One incorrectly called resistant.
e
One incorrectly called intermediate.
f
Two incorrectly called resistant.