Table 1. Prevalence of Shiga toxin-producing Escherichia coli O157 in wild deer and boars by prefectures.

District	Prefecture	Wild deer		Wild boar
		No. of samples	No. of positive samples (%)	No. of samples	No. of positive samples (%)
Hokkaido	A	13	0	n.a.
Kita Kanto/Koushin	B	1	0	4	0
	C	33	0	n.a.
	F	9	0	n.a.
Minami Kanto	D	22	0	22	0
	E	20	0	4	0
Hokuriku	F	n.a.		9	0
	G	n.a.		3	0
Tokai	H	53	3 (5.7)	8	0
	I	6	0	2	0
	J	4	0	2	0
	K	18	0	n.a.
Kinki	L	30	0	n.a.
	M	39	6 (15.4%)	n.a.
	N	2	0	n.a.
Chuugoku	O	22	0	8	0
	P	9	0	2	0
	Q	n.a.		2	0
Shikoku	R	87	0	92	0
	S	n.a.		6	0
Kyushu	T	51	0	n.a.
	U	31	0	243	3 (1.2%)
	V	7	0	17	0
	W	9	0	n.a.
	X	8	0	2	0
Total	474	9 (1.9%)	426	3 (0.7%)

n.a.: not applicable.