Inactivated vaccine containing Massachusetts and D274 serotypes of Infectious Bronchitis virus (> 5.5 log2 VN units each per dose), the Clone 30 strain of Newcastle Disease Virus (> 4.0 log2 HI units) and Egg Drop Syndrome ‘76 virus (> 6.5 log2 HI units), inactivated with formalin and suspended in the aqueous phase of an oil adjuvant emulsion containing liquid paraffin.