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. 2015 Jun 25;10(6):e0130662. doi: 10.1371/journal.pone.0130662

Table 2. Apparent prevalence of low pathogenic avian influenza virus in Blue-winged Teal (Anas discors) in Canada and the United States, 2007–2010.

Proportion n % AIV positive 95% CI
Overall 13574 17.8 17.17, 18.45
By age
 HY 9113 21.4 20.57, 22.25
 AHY 4461 10.4 9.59, 11.38
By sex
 Female 7491 17.6 16.78, 18.51
 Male 6083 18.0 17.05, 18.99
By season
 Nov-June 1463 9.5 8.12, 11.06
 July-Aug 3395 22.9 21.51, 24.38
 Sept-Oct 8716 19.3 18.49, 20.15
By year
 2007 3347 19.21 17.91, 20.58
 2008 3636 12.24 11.21, 13.35
 2009 3085 18.41 17.08, 19.82
 2010 3506 21.68 20.35, 23.07
By flyway (ref = Atlantic)
 Pacific 40 7.5 2.6, 19.8
 Central 7311 20.8 19.87, 21.73
 Mississippi 4934 15.6 14.62, 16.65
 Atlantic 1289 9.6 8.13, 11.35

Abbreviations: HY = hatch year (including SY), AHY = after hatch year (including ASY), AIV = Avian influenza virus matrix protein gene.