Infectious bursitis vaccine comprising an Infectious Burstitis virus capable of protecting poultry

摘要

A vaccine that is capable of protecting poultry against Infectious Bursitis infections is described. It is characterised in that it contains an Infectious Bursal Disease Virus (IBDV), which has the combined properties of, when administered to a chicken, causing a reduction in the size of the bursa, expressed as bursa/body weight ratio of less than 55 %, and the capability to protect poultry having an ELISA antibody titer of at least 500.