Table 3 Microbiologic diagnosis in 525 children and adolescents with community acquired pneumonia, stratified by age group

Respiratory syncytial virus A and B

91 (44.2)

56 (26.3)

17 (16.0)

164 (31.2)

Parainfluenza virus 1, 2, 3, 4

51 (24.8)

53 (24.9)

18 (17.0)

122 (23.2)

Rhinovirus A/B/C

41 (19.9)

49 (23.0)

21 (19.8)

111 (21.1)

Influenza virus A and B

42 (20.4)

37 (17.4)

17 (16.0)

96 (18.3)

Mycoplasma pneumoniae

22 (10.7)

37 (17.4)

14 (13.2)

73 (13.9)

Adenovirus

32 (15.5)

27 (12.7)

9 (8.5)

68 (13.0)

Streptococcus pneumoniae

24 (11.7)

28 (13.1)

7 (6.6)

59 (11.2)

Moraxella catarrhalis

23 (11.2)

15 (7.0)

3 (2.8)

41 (7.8)

Metapneumovirus

23 (11.2)

9 (4.2)

5 (4.7)

37 (7.0)

Bordetella pertussis

12 (5.8)

7 (3.3)

6 (5.7)

25 (4.8)

Haemophilus influenzae

12 (5.8)

7 (3.3)

5 (4.7)

24 (4.6)

Coronavirus 229E/NL63 and OC43

6 (2.9)

7 (3.3)

2 (1.9)

15 (2.9)

Staphylococcus aureus

3 (1.4)

3 (1.4)

5 (4.7)

11 (2.1)

Chlamydophila pneumoniae

0 (0)

3 (1.4)

7 (6.6)

10 (1.9)

Legionella pneumophila

0 (0)

3 (1.4)

6 (5.7)

9 (1.7)

Mycobacterium tuberculosis

3 (1.4)

2 (0.9)

1 (0.9)

6 (1.1)

Enterovirus

2 (1.0)

2 (0.9)

2 (1.9)

6 (1.1)

Enterobacteriaceae^a

3 (1.4)

2 (0.9)

1 (0.9)

6 (1.1)

Coxiella burnetii

3 (1.4)

2 (0.9)

0 (0)

5 (1.0)

Other Gram-positive bacteria^b

2 (1.0)

1 (0.5)

0 (0)

3 (0.6)

Bocavirus 1/2/3/4

2 (1.0)

0 (0)

0 (0)

2 (0.4)

Gram-negative bacilli^c

1 (0.5)

1 (0.5)

0 (0)

2 (0.4)

Chlamydia trachomatis

1 (0.5)

0 (0)

0 (0)

1 (0.2)

Haemophilus parainfluenzae

1 (0.5)

0 (0)

0 (0)

1 (0.2)

No identified microorganism

21 (10.2)

38 (17.8)

25 (23.6)

84 (16.0)

At least one virus

170 (82.5)

145 (68.1)

63 (59.4)

378 (72)

At least one pyogenic bacterium

65 (31.6)

61 (28.6)

23 (21.7)

149 (28.4)

At least one atypical bacterium

35 (17)

46 (21.6)

30 (28.3)

111 (21.1)