Long-term avian influenza virus epidemiology in a small Spanish wetland ecosystem is driven by the breeding Anseriformes community

Table 3 Yearly prevalence of AIV detected and bird phenological event

Year	Spring migration		Breeding		Autumn migration		Wintering		Total
Year	Prev (%) ± 95% CI	Pos/N	Prev (%) ± 95% CI	Pos/N	Prev (%) ± 95% CI	Pos/N	Prev (%) ± 95% CI	Pos/N	Prev (%) ± 95% CI	Pos/N
2007	–	–	–	–	–	–	0.0	0/95	0.0	0/95
2008	0.0	0/154	31.4 ± 16.2	11/35	2.1 ± 4.3	1/47	0.0	0/136	3.2 ± 1.8	12/372
2009	1.0 ± 2.0	1/98	18.2 ± 27.2	2/11	31.9 ± 9.7	29/91	–	–	16.0 ± 5.1	32/200
Total 2007–2009	0.4 ± 0.8	1/252	28.3 ± 13.5	13/46	21.7 ± 7.0	30/138	0.0	0/231	6.6 ± 1.9	44/667
2012	0.0	0/214	1.0 ± 1.5	2/192	0.0	0/102	0.0	0/203	0.3 ± 0.4	2/711
2013	0.0	0/305	0.0	0/106	0.9 ± 0.8	4/465	0.3 ± 0.5	1/384	0.4 ± 0.3	5/1260
2014	0.0	0/159	0.3 ± 0.6	1/341	0.0	0/129	0.0	0/125	0.1 ± 0.3	1/754
Total 2012–2014	0.0	0/678	0.5 ± 0.5	3/639	0.6 ± 0.5	4/696	0.1 ± 0.3	1/712	0.3 ± 0.2	8/2725

– Indicates not sampled.
Prev: AIV prevalence, CI: 95% confidence interval, N: number of samples analysed, Pos: number of AIV positive samples.

ISSN: 1297-9716