Comparative study between prepared bivalent IB inactivated vaccine and commercial one

Abstract

Infectious bronchitis is a highly contagious disease, considered as one of the most important poultry diseases and it causes huge economic losses in poultry industry due to its effect on broiler growth and egg production quantity and quality in laying hens, Egyptian poultry farms suffer from frequent respiratory disease outbreaks associated with IBV variant 2 strains. Inactivated vaccines are important component in vaccination program of layers and breeders for egg production and also provide protection against early infection through maternal immunity\u202fin progeny. In this study, a newly prepared inactivated classical and variant 2 vaccine was compared for its field efficacy with commercial (NDI also combination of inactivated variant and classical IBV strains confers broad protection against both homologous and heterologous challenge in IBV endemic areas.