Immunoreactivity and morphological changes of bursal follicles in chickens infected with vaccine or wild-type strains of the infectious bursal disease virus.

The article presents a study which assesses the bursa of Fabricius pathologically with a focus on the bursal follicle and immunoreactivity in chickens administered with a vaccine strain or wild-type strain of the infectious bursal disease virus (IBDV). The immunoreactivity to Newcastle disease virus was also evaluated with the hemagglutination inhibition test. The results indicate that the retained number of normal follicles is important for the immunoreactivity of chickens infected with IBDV.