Table 1.

Source of Shigella sonnei strains (n = 340), by year and by city, 2002–2011.

Characteristic	No. of strains	%
Year
2002	6	1.8
2003	2	0.6
2004	6	1.8
2005	7	2.1
2006	19	5.6
2007	48	14.1
2008	89	26.2
2009	98	28.8
2010	33	9.7
2011	32	9.4
City
Changzhou	75	22.1
Huai’an	15	4.4
Lianyungang	21	6.2
Nanjing	36	10.6
Nantong	63	18.5
Suqian	0	0.0
Suzhou	22	6.5
Taizhou	4	1.2
Wuxi	28	8.2
Xuzhou	27	7.9
Yancheng	7	2.1
Yangzhou	17	5.0
Zhenjiang	25	7.4