Table 1. Studies estimating seroprevalence and case prevalence of HD in various US states (case prevalence is calculated from Southeastern Cooperative Wildlife Disease Study records 1980–2007).

State	Number positive	Number sampled	Percent positive	Virus	Study years	Reference	County-years positive	County-years reporting	Proportion positive
	Seroprevalence						Case prevalence
Alabama	70	140	50	EHDV, BTV or Both	1981–1989	[13]	421	1876	0.22
Arkansas	56	164	34	EHDV, BTV or Both	1981–1989	[13]	293	2100	0.14
Florida	95	189	50	EHDV, BTV or Both	1981–1989	[13]	155	1876	0.08
Kentucky	4	21	19	EHDV, BTV or Both	1981–1989	[13]	286	3360	0.09
Louisiana	61	164	37	EHDV, BTV or Both	1981–1989	[13]	200	1792	0.11
Maryland	6	68	9	EHDV, BTV or Both	1981–1989	[13]	75	672	0.11
Mississippi	27	57	47	EHDV, BTV or Both	1981–1989	[13]	703	2296	0.31
North Carolina	4	44	9	EHDV, BTV or Both	1981–1989	[13]	333	2800	0.12
South Carolina	65	112	58	EHDV, BTV or Both	1981–1989	[13]	237	1288	0.18
Tennessee	11	29	38	EHDV, BTV or Both	1981–1989	[13]	173	2660	0.07
Virginia	2	25	8	EHDV, BTV or Both	1981–1989	[13]	809	3752	0.22
West Virginia	31	125	25	EHDV, BTV or Both	1981–1989	[13]	74	1540	0.05
Georgia	699	3077	23	EHDV, BTV or Both	1981–1989	[13]	599	4452	0.13
Kansas	60	87	69	EHDV, BTV or Both	1998–2002	[15]	79	2940	0.03
Oklahoma	146	194	75	EHDV or BTV	1977–1984	[12]	29	2156	0.01
Texas	574	685	84	EHDV, BTV or Both	1991–1992	[14]	108	7112	0.02