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Table 3 Yearly prevalence of AIV detected and bird phenological event

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

Year Spring migration Breeding Autumn migration Wintering Total
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
  1. – Indicates not sampled.
  2. Prev: AIV prevalence, CI: 95% confidence interval, N: number of samples analysed, Pos: number of AIV positive samples.