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Influence of Age and Congenital Immunity Upon Immunization with an Avian Infectious Bronchitis Vaccine

From the School of Veterinary Medicine, University of California, Davis, California

Abstract

A study of the serological and immune responses of birds of two different ages with or without a high level of congenital antibodies to infectious bronchitis virus (IBV) indicated that both young age and congenital immunity were important factors in preventing a satisfactory response to this vaccinal strain of IBV.

Discrepancies between the serological and the response to challenge were noted in the younger groups of birds.