Serological investigations of infectious bursal disease virus and reticuloendotheliosis virus infections in New Zealand chickens

Abstract Extract Sir:- Between 1975 and 1981, sera were collected from 89 New Zealand chicken farms representing a variety of laying and meat birds of different ages from both primary breeders and commercial flocks. In some instances samples were collected from one or more flocks on a farm. In most cases between ten and 20 birds were sampled in a flock and the sera pooled to give a composite sample for testing.