Table 1.

The epidemiological and clinical characteristics of samples (n = 5239) in this study

Category	Subcategory	No. (%)
Year	2013	931 (17.8)
	2014	793 (15.1)
	2015	652 (12.5)
	2016	1285 (24.5)
	2017	887 (16.9)
	2018	691 (13.2)
Age (years)	< 5	1361 (26.0)
	5 ~ 9	73 (1.4)
	10 ~ 19	217 (4.1)
	20 ~ 29	847 (16.2)
	30 ~ 39	984 (18.8)
	40 ~ 49	683 (13.0)
	50 ~ 59	496 (9.5)
	> = 60	578 (11.0)
Clinical Symptoms	Abdominal pain	2098 (54.1) a
	Fever	310 (5.9)
	Vomiting	635 (12.1)
	Blood in stools	50 (1.0)

^aOnly 3878 cases aged over 5 years were included for analysis