Table 3 Etiologic diagnosis by receipt of antibiotics prior to admission versus non-receipt*
Microorganisms | Prior Antibiotic Use n = 128 N (%) | No Prior Antibiotic Use n = 605 N (%) | P-value |
|---|---|---|---|
Streptococcus pneumoniae | 2 (2) | 58 (10) | 0.003 |
Staphylococcus aureus | 4 (3) | 34 (6) | 0.2 |
Pseudomonas aeruginosa | 6 (5) | 14 (2) | 0.1 |
Haemophilus influenzae | 0 (0) | 19 (3) | 0.04 |
Klebsiella pneumoniae | 1 (1) | 7 (1) | 0.8 |
Escherichia coli | 2 (1) | 7 (1) | 0.7 |
Proteus mirabilis | 0 (0) | 3 (1) | 0.4 |
Miscellaneous ** | 2 (2) | 8 (1) | 0.6 |
Polymicrobial | 2 (2) | 10 (2) | 0.9 |
No pathogen isolated | 109 (85) | 445 (74) | 0.006 |