Table 4.

Prevalence of four main infectious aetiologies among diarrhoeal and healthy children, by age groups, China, May 2011 to January 2012

Infectious agent	0–6 months		7–12 months		13–24 months		>24 months
Case (n = 125)	Control (n = 125)	Case (n = 177)	Control (n = 177)	Case (n = 132)	Control (n = 132)	Case (n = 27)	Control (n = 27)
Rotavirus	26 (10.4%)	0 (0)	67 (37.9%)	1 (0.6%)	71 (53.8%)	0 (0)	2 (7.4%)	0 (0)
Norovirus GII	17 (13.6%)	2 (1.6%)	36 (20.3%)	2 (1.1%)	23 (17.4%)	4 (3.0%)	3 (11.1%)	0 (0)
Adenovirus	13 (10.4%)	2 (1.6%)	16 (9.0%)	6 (3.4%)	17 (12.9%)	4 (3.0%)	4 (14.8%)	0 (0)
Shigella	2 (1.6%)	0 (0)	1 (0.6%)	0 (0)	0 (0)	0 (0)	5 (18.5%)	1 (3.7%)