Table 2. Spatial-temporal clusters of scrub typhus in Guangzhou city, China, 2006–2012.

Year	Cluster type*	Time	Location	No. Obs	No. Exp	RR	P
2006	1	5/22–10/22	Conghua, Zengcheng	52	18	3.3	<0.001
	2	7/3–7/30	Nansha, Panyu	19	5	4.1	<0.001
	3	6/5–9/24	Huadu	23	7	3.5	<0.001
2007	1	5/22–11/19	Conghua, Zengcheng	74	18	5.1	<0.001
	2	5/8–11/5	Nansha, Panyu	49	24	2.3	0.002
	3	5/8–10/22	Huadu	28	9	3.2	<0.001
2008	1	5/22–11/19	Conghua, Zengcheng,	124	28	6.0	<0.001
	2	5/8–11/5	Nansha, Panyu	90	35	3.0	<0.001
	3	5/8–7/16	Huadu	18	6	3.2	0.036
2009	1	5/22–11/5	Conghua, Zengcheng	165	32	7.1	<0.001
	2	5/22–9/10	Nansha, Panyu	82	26	3.6	<0.001
	3	5/22–9/10	Huadu	32	11	3.0	<0.001
2010	1	5/22–11/19	Conghua, Zengcheng	161	36	5.8	<0.001
	2	5/22–7/16	Nansha, Panyu	91	15	7.4	<0.001
		5/22–11/19	Huadu	50	19	2.9	<0.001
2011	1	5/22–11/19	Conghua, Zengcheng,	234	42	8.2	<0.001
	2	6/5–8/13	Nansha, Panyu	90	20	5.1	<0.001
	3	7/3–8/27	Huadu	34	8	4.8	<0.001
2012	1	5/22–11/5	Conghua, Zengcheng	408	75	7.6	<0.001
	2	5/8–6/18	Nansha, Panyu	105	23	4.9	<0.001
	3	5/22–10/8	Huadu	123	36	3.7	<0.001
	4	5/8–6/18	Haizhu	38	18	2.2	0.025

*1: Primary cluster; 2–4: Secondary cluster; No. Obs: number of observed cases; No. Exp: number of expected cases; RR: relative risk for the cluster compared with the rest of the city.