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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: Ann N Y Acad Sci. 2010 May;1195:113–128. doi: 10.1111/j.1749-6632.2010.05451.x

Figure 1. Presence and prevalence of influenza virus subtypes in shorebirds (charadriiforms) and ducks (anseriforms) from a 25 year study in North America22.

Figure 1

A) Presence and absence of viral subtypes in the two groups of birds. B) Fraction of birds shedding virus of each of 44 influenza virus subtypes for shorebirds and ducks. Shorebirds were sampled during spring migration (May) in Delaware Bay, New Jersey, USA, whereas ducks were sampled in the late summer and fall (July –September) in Alberta, Canada.