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Table 3 Etiologic diagnosis by receipt of antibiotics prior to admission versus non-receipt*

From: Impact of prior outpatient antibiotic use on mortality for community acquired pneumonia: a retrospective cohort study

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
  1. * Percentages have been rounded and may not sum 100.
  2. ** Miscellaneous consists of Acinetobacter spp., Aspergillus spp., Haemophilus parainfluenzae, Enterococcus spp. and Streptococcus spp.