Sampling Details.

3<p>Cedar Point Biological Station, Keith County, Nebraska.</p

Total IgY ELISA Results.

<p>Values shown represent mean (+ SEM) optical density values (O.D._450nm) for total IgY in cliff swallows and house sparrows. NS =  non-significant difference (<i>P</i>>0.45).</p

BCRV ELISA.

<p>Values shown represent mean (+ SEM) values for BCRV specific IgY levels in each group. House sparrow Control samples collected from house sparrows at Council Bluffs, Iowa (no known cliff swallow colonies in the area) in August, 2011. All other blood samples collected from house sparrows and cliff swallows at swallow colony sites in western Nebraska in 2011. Letters above bars denote statistical differences among groups (<i>P</i><0.05); bars not sharing the same letter are different.</p