Summary of immunization data obtained with chickens.

Concluding table summarizing the results of the Elisa, serum neutralization assay, mortality rate and bursal lesion scores. The titers determined according to the IDEXX-instructions are given. The dilution threshold of serum neutralization (VN) was set at 8 (23) indicating that 4 of 19 chickens (ca. 40%) that were orally vaccinated and 5 of 5 (100%) chickens that were subcutaneously vaccinated with the K. lactis yeast VAK890 developed IBDV-specific neutralizing antibodies. As indicated by lesion scores of 1 and 2, 2 of 19 chickens (ca. 10%) that were orally vaccinated and 4 of 5 chickens (80%) that were subcutaneously vaccinated with the K. lactis yeast VAK890 were fully protected against a subsequent IBDV infection.