Evidence for seasonal patterns in the relative abundance of avian influenza virus subtypes in blue-winged teal ( Anas discors )

Abstract Seasonal dynamics of influenza A viruses (IAVs) are driven by host density and population immunity. Through an analysis of subtypic data for IAVs isolated from Blue-winged Teal (Anas discors), we present evidence for seasonal patterns in the relative abundance of viral subtypes in spring and summer/autumn.