Table 2 Causative organisms

Streptococcus pneumoniae

10 (45%)

5 (22%)

15

ns

   Sputum

1

   Sputum + urinary antigen

1

1

   Urinary antigen

3

3

   Blood culture

1

1

   Sputum + blood culture+ urinary antigen

2

   Blood culture + urinary antigen

2

Legionella pneumophila

5 (23%)

7 (30%)

12

ns

   Sputum + urinary antigen

1

   Urinary antigen

3

   Sputum + serology

1

   Sputum + urinary antigen + serology

1

   Urinary antigen + serology

3

   Serology

3

Haemophilus influenzae

   Sputum

1 (4%)

1 (4%)

2

ns

Streptococcus viridans

   Blood culture

1 (4%)

1

ns

Atypical pathogens (serology)

2

ns

Mycoplasma pneumoniae

1 (4%)

1 (4%)

2

ns

   - Chlamydia pneumoniae

2 (9%)

2

ns

   - Chlamydia psittaci

1 (4%)

1

ns

   - Coxiella burnetti

1 (4%)

1

ns

No etiological diagnosis

4 (18%)

5 (22%)

9

ns