Equine Infectious Anaemia: The Active Surveillance of an Entire Equid Population Reduces the Occurrence of the Infection

Table 2

EIA-tested samples, coverage of the whole population, seroprevalence, and related confidence intervals per species/hybrids.

Species/hybrids	Year	Tested samples (N)	Coverage (%)	Seroprevalence (%)	95% CIs
					Lower	Upper
Horses	2007	221,916	59	0.21	0.19	0.23
	2008	242,806	65	0.18	0.16	0.19
	2009	224,318	60	0.10	0.09	0.11
	2010	234,259	63	0.10	0.06	0.14
	2011	154,165	41	0.07	0.04	0.13
	2012	177,690	48	0.04	0.01	0.08
Mules	2007	1,772	20	10.27	8.85	11.68
	2008	2,634	29	10.52	9.38	11.77
	2009	2,202	24	4.81	3.98	5.81
	2010	2,784	31	4.70	3.93	5.54
	2011	2,387	27	1.72	1.32	2.44
	2012	1,299	14	2.08	1.40	3.05
Donkeys	2007	9,376	39	0.04	0.01	0.12
	2008	5,463	23	0.16	0.08	0.32
	2009	11,532	48	0.03	0.01	0.10
	2010	14,695	61	0.11	0.06	0.18
	2011	11,324	47	0.03	0.01	0.08
	2012	17,277	72	0.02	0.00	0.06