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Virus-neutralizing antibody kinetics in sera and IgY from immunized hens. Chicken blood samples (A) collected at the indicated time points and IgY (B) extracted from egg yolk were subjected to a virus neutralization assay against SM98-1. The neutralizing antibody titers of the groups were plotted as a log2 scale. Values are representative of the mean from three independent experiments carried out in duplicate, and the error bars denote the standard deviations
