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

Table 3

EIA-tested holdings, coverage of the whole population, number of outbreaks, seroprevalence, and seroprevalence 95% confidence intervals (CIs).

Year	Tested holdings (N; coverage %)	No. of outbreaks	Seroprevalence (%)	95% CIs
				Lower	Upper
2007	46,166 (37.5)	356	0.77	0.61	1.00
2008	48,586 (39.5)	334	0.69	0.53	0.87
2009	45,702 (37.1)	145	0.32	0.21	0.45
2010	49,121 (39.9)	132	0.27	0.18	0.39
2011	37,773 (30.7)	76	0.20	0.12	0.35
2012	40,920 (33.3)	43	0.11	0.05	0.14
Total	94,129 (76.5)	1,086	1.15	1.09	1.23