TABLE 3.
Antimicrobial susceptibility test distribution by specimen type for the most common etiologic agents of HAP/VAP
| Etiologic agent | BAL |
ETA |
Overall |
||||||
|---|---|---|---|---|---|---|---|---|---|
| No. of isolates | AST |
No. of isolates | AST |
No. of isolates | AST |
||||
| n | % | n | % | n | % | ||||
| Gram positive, monomicrobial | |||||||||
| Staphylococcus aureus | 2,544 | 2,252 | 88.5 | 3,660 | 3,440 | 94.0 | 6,204 | 5,692 | 91.7 |
| Streptococcus pneumoniae | 542 | 469 | 86.5 | 588 | 500 | 85.0 | 1,130 | 969 | 85.8 |
| Gram negative, monomicrobial | |||||||||
| Acinetobacter spp. | 122 | 108 | 88.5 | 206 | 195 | 94.7 | 328 | 303 | 92.4 |
| Escherichia coli | 464 | 427 | 92.0 | 618 | 595 | 96.3 | 1,082 | 1,022 | 94.5 |
| Enterobacter spp. | 338 | 317 | 93.8 | 512 | 499 | 97.5 | 850 | 816 | 96.0 |
| Haemophilus spp. (full AST) | 791 | 201 | 25.3 | 798 | 246 | 30.8 | 1,589 | 447 | 28.1 |
| Haemophilus spp. (β-lactamase test) | 791 | 439 | 55.5 | 798 | 538 | 67.4 | 1,589 | 977 | 61.5 |
| Klebsiella spp. | 523 | 483 | 92.4 | 861 | 834 | 96.9 | 1,384 | 1,317 | 95.2 |
| Pseudomonas aeruginosa | 1,617 | 1,424 | 88.0 | 1,892 | 1,790 | 94.6 | 3,509 | 3,214 | 91.6 |
| Serratia marcescens | 218 | 190 | 87.1 | 312 | 304 | 97.4 | 530 | 494 | 93.2 |
| Stenotrophomonas maltophilia | 317 | 283 | 89.3 | 330 | 301 | 91.2 | 647 | 584 | 90.3 |
| Total | 7,476 | 6,154 | 82.3 | 9,777 | 8,704 | 89.0 | 17,253 | 14,858 | 86.1 |