Sera from PDD-affected Bird Z178/08, asymptomatic ABV PCR-positive Birds Z14/09-13 and Z14/09-05, and healthy PCR- negative Bird Z14/09-47, were evaluated by western blot analysis using recombinant ABV P and N, as well as BDV P and N (p23, p40), demonstrating a strong reaction to ABV N with limited cross-reactivity to BDV N.