Table 1: Numbers of patients with seasonal influenza A and pandemic H1N1 and numbers of relevant bacteria spp. isolated from these patients. Number (% of the total).

Influenza AH1N1Statistical analysis

Total number of patients352742
Year2005–20082009
Patients with bacterial samples taken240 (68.18%)99 (13.34%)
Patients with positive bacterial findings33 (9.38%)38 (5.12%)
Respiratory cultures
 Patients with positive upper airway cultures*(nasopharynx/throat)20 (5.68%)15 (2.02%)
 S. pneumoniae 10 (2.84%)10 (1.35%)ND
  H. influenzae 5 (1.42%)4 (0.54%)ND
  M. catarrhalis 8 (2.27%) 3 (0.40%)ND
  S. aureus 03 (0.40%)ND
  S. pyogenes (group A streptococci) 2 (0.57%)0ND
Patients with positive lower airway cultures (sputum/bronchoalveolar lavage)13 (3.69%)
12 (1.62%)
  S. pneumoniae 5 (1.42%)(0.1%)ND
  H. influenza 2 (0.57%)0ND
  M. catarrhalis 1 (0.28%)1 (0.13%)ND
  S. aureus 3 (0.85%)5 (0.67%)ND
Coagulase negative staphylococci02 (0.27%)ND
  S. dysgalactiae (group G streptococci) 02 (0.27%)ND
  S. pyogenes (group A streptococci) 1 (0.28%)0ND
  Enterobacteriaceae 1 (0.28%)1 (0.13%)ND
Blood cultures**
  All positive blood cultures8 (2.27%)12 (1.62%)NS
  S. pneumoniae 1 (0.28%)4 (0.54%)ND
  S. aureus 1 (0.28%)1 (0.13%)ND
  H. influenzae 1 (0.28%)0ND
Viridans streptococci1 (0.28%)0ND
  S. pyogenes (group A streptococci) 01 (0.13%)ND
  Coagulase-negative staphylococci4 (1.14%)6 (0.81%)ND

Several patients had multiple findings. **One patient had multiple findings. ND: not determined; NS: not significant.