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Table 1 Demographic and clinical presentation of the study patients by viral type and subtype.

From: Clinical and socioeconomic impact of different types and subtypes of seasonal influenza viruses in children during influenza seasons 2007/2008 and 2008/2009

Data Viral findings
  Influenza A/H1N1
(n = 143)
Influenza A/H3N2
(n = 519)
Influenza B
(n = 239)
Males 79 (55.2) 312 (60.1) 125 (52.3)
Mean age ± SD, yrs 2.33 ± 1.40*° 4.69 ± 3.07 5.17 ± 3.21
Age groups, No. (%)    
   < 2 yrs 39 (27.3)* 22 (4.2) 76 (31.8)*
   2-5 yrs 103 (72.0)*° 491 (94.6) 74 (30.9)*
   > 5 yrs 1 (0.7)° 6 (1.2) 89 (37.2)*
Presence of fever" (%) 109 (76.2)* 452 (87.1) 179 (74.8)*
   High-grade fever° (%) 106 (74.1)* 416 (80.2) 169 (70.7)*
Respiratory tract infection (%) 128 (89.5) 436 (84.0) 205 (85.8)
Upper respiratory tract
Infection (%)
107 (61.5)* 261 (50.3) 164 (68.7)*
Common cold (%) 69 (48.3)* 56 (10.8) 92 (38.5)*
Pharyngitis (%) 33 (23.1) 140 (26.9) 54 (22.5)
Acute otitis media (%) 9 (6.3) 46 (8.9) 14 (5.9)
Croup (%) 4 (2.8) 11 (2.1) 4 (1.7)
Lower respiratory tract
infection (%)
21 (14.6)* 175 (33.7) 41 (17.2)*
Acute bronchitis (%) 24 (16.8)° 83 (15.9) 21 (8.8)*
Wheezing (%) 3 (2.0)* 58 (11.1) 7 (2.9)*
Pneumonia (%) 0 (0.0)* 34 (6.5) 13 (5.4)
Gastroenteritis (%) 5 (3.5) 17 (3.3) 11 (4.6)
Fever without source (%) 6 (4.2)* 52 (10.0) 7 (2.9)*
Febrile seizures (%) 4 (2.7) 14 (2.7) 4 (1.7)
Myositis (%) 0 (0.0)° 0 (0.0) 12 (5.0)
  1. "Defined as an axillary temperature of ≥37.6°C or a rectal temperature of ≥38°C; °defined as an axillary temperature of ≥39°C or a rectal temperature of ≥39.5°C. SD, standard deviation. °p < 0.05 vs influenza B; *p < 0.05 vs A/H3N2; no other statistically significant differences.