Table 2.

Clinical characteristics of pH1N1 and seasonal influenza by age category

	pH1N1 symptoms, n (%)				Seasonal influenza symptoms, n (%)
	0 to <2 years, n (%)	2 to <5 years, n (%)	≥5 years, n (%)	0 to <18 years, n (%)	0 to <2 years, n (%)	2 to <5 years, n (%)	≥5 years, n (%)	0 to <18 years, n (%)
Fever	31 (100)	36 (97)	99 (92)	166 (94)	64 (86)	45 (83)	59 (82)	168 (84)
Cough	29 (94)	34 (92)	84 (78)	147 (84)	34 (46)	29 (54)	39 (54)	102 (51)
Gastrointestinal	14 (45)	16 (43)	40 (37)	70 (40)	13 (15)	14 (26)	6 (8)	33 (16)
Wheeze	4 (13)	8 (22)	24 (22)	36 (20)	11 (15)	5 (9)	14 (19)	30 (15)
Pneumonia	11 (35)	12 (32)	29 (27)	52 (30)	9 (12)	8 (15)	19 (26)	36 (18)
Apnoea	3 (10)	3 (8)	2 (2)	8 (5)	0 (0)	0 (0)	0 (0)	0 (0)
Seizure	2 (7)	5 (14)	2 (2)	9 (5)	8 (11)	6 (11)	4 (6)	18 (9)
Encephalopathy	1 (3)	1 (3)	2 (2)	4 (2)	0 (0)	0 (0)	1 (14)	1 (0.5)
Myocarditis	0 (0)	1 (3)	1 (1)	2 (1)	0 (0)	0 (0)	0 (0)	0 (0)
Myositis	0 (0)	0 (0)	2 (2)	2 (1)	0 (0)	1 (2)	0 (0)	1 (0.5)

pH1N1, pandemic H1N1.