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. 2013 Jun 6;67(3):185–193. doi: 10.1016/j.jinf.2013.05.006

Table 1.

Causative organisms in hospitalized patients with CAP during the first post-pandemic influenza season (2010–2011).a

N = 747 n (%)
Bacterial 154 (21.9)b
Streptococcus pneumoniae 98 (13.1)
Haemophilus influenzae 13 (1.7)
Staphylococcus aureusc 11 (1.5)
Pseudomonas aeruginosa 9 (1.2)
Legionella pneumophila 6 (0.8)
Others 17 (2.2)



Viral 125 (16.7)
Influenza A (H1N1)pdm09 96 (12.8)
Rhinovirus 16 (2.1)
Influenza B 5 (0.6)
Parainfluenza 4 (0.5)
Others 4 (0.5)



Mixed 36 (4.8)
Influenza A (H1N1)pdm09 + S. Pneumoniae 11 (1.5)
Rhinovirus + S. pneumoniae 3 (0.4)
Influenza B + S. pneumoniae 3 (0.4)
RSV + S. pneumoniae 3 (0.4)
Others 16 (2.1)
Unknown aetiology 432 (57.2)

CAP, community-acquired pneumonia; RSV, respiratory syncytial virus.

a

The number of diagnostic test performed were: RT-PCR 667, sputum culture 382, blood culture 445, pleural effusion culture 40, bronchoalveolar lavage culture (BAL) 49, pneumococcal urinary antigen test (PUAT) 617, and Legionella pneumophila urinary antigen test 570.

b

S. pneumoniae was identified by means of sputum culture (26 cases), blood culture (23), BAL (3), and PUAT (96); Haemophilus influenzae by sputum culture (15), blood culture (2), and BAL (1); Staphylococcus aureus by sputum culture (8), blood culture (6), and BAL (3); Pseudomonas aeruginosa sputum culture (13), blood culture (2), and BAL (1); and Legionella pneumophila by urinary antigen test (6).

c

Six cases were methicillin-resistant S. aureus.