Table 1. Ertapenem susceptibility of Enterobacteriaceae isolates as determined by commercial broth microdilution systems*.
| Hospital | N (%) of isolates | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
E. coli (n=8,167) |
K. pneumoniae (n=2,946) |
E. cloacae (n=639) |
E. aerogenes (n=622) |
S. marcescens (n=363) |
C. freundii (n=268) |
Total (n=13,005) |
|||||||||||||||
| S | I | R | S | I | R | S | I | R | S | I | R | S | I | R | S | I | R | S | I | R | |
| A | 1,501 (99.9) |
0 (0) |
2 (0.1) |
623 (97.2) |
2 (0.3) |
16 (2.5) |
96 (72.7) |
6 (4.6) |
30 (22.7) |
116 (92.8) |
0 (0) |
9 (7.2 |
101 (81.5) |
0 (0) |
23 (18.5) |
43 (97.7) |
0 (0) |
1 (2.3) |
2,480 (96.5) |
8 (0.3) |
81 (3.2) |
| B | 1,273 (99.4) |
5 (0.4) |
2 (0.2) |
393 (91.8) |
7 (1.7) |
28 (6.5) |
120 (85.7) |
13 (9.3) |
7 (5.0) |
104 (95.4) |
2 (1.8) |
3 (2.8) |
72 (96.0) |
0 (0) |
3 (4.0) |
52 (100) |
0 (0) |
0 (0) |
2,014 (96.6) |
27 (1.3) |
43 (2.1) |
| C | 2,251 (99.6) |
0 (0) |
9 (0.4) |
729 (89.5) |
5 (0.6) |
81 (9.9) |
139 (82.7) |
0 (0) |
29 (17.3) |
159 (98.8) |
0 (0) |
2 (1.2) |
85 (84.2) |
0 (0) |
16 (15.8) |
83 (97.6) |
0 (0) |
2 (2.4) |
3,446 (96.0) |
5 (0.1) |
139 (3.9) |
| D | 1,900 (99.4) |
7 (0.4) |
4 (0.2) |
507 (99.2) |
3 (0.6) |
1 (0.2) |
117 (89.3) |
2 (1.5) |
12 (9.2) |
149 (98.0) |
0 (0) |
3 (2.0) |
41 (93.2) |
2 (4.5) |
1 (2.3) |
40 (97.6) |
0 (0) |
1 (2.4) |
2,754 (98.7) |
14 (0.5) |
22 (0.8) |
| E | 1,206 (99.4) |
2 (0.2) |
5 (0.4) |
517 (93.9) |
4 (0.7) |
30 (5.4) |
59 (86.8) |
2 (2.9) |
7 (10.3) |
73 (97.3) |
0 (0) |
2 (2.7) |
18 (94.7) |
0 (0) |
1 (5.3) |
45 (97.8) |
1 (2.2) |
0 (0) |
1,918 (97.3) |
9 (0.4) |
45 (2.3) |
| Total | 8,131 (99.5) |
14 (0.2) |
22 (0.3) |
2,769 (94.0) |
21 (0.7) |
156 (5.3) |
531 (83.1) |
23 (3.6) |
85 (13.3) |
601 (96.6) |
2 (0.3) |
19 (3.1) |
317 (87.3) |
2 (0.6) |
44 (12.1) |
263 (98.1) |
1 (0.4) |
4 (1.5) |
12,612 (97.0) |
63 (0.5) |
330 (2.5) |
*Isolated from hospital A, C, D, and E were tested with the Vitek 2 system, and those from hospital B were tested with the MicroScan system.
Abbreviations: S, susceptible; I, intermediate; R, resistant.