Pathological Studies on Newcastle Disease

I. Central-Nervous-System Lesions Accompanied by Necrotic Foci Caused by Asian Type Newcastle Disease

Abstract

When vaccinated chickens of a flock were infected with Asian type Newcastle disease (ND), some of them showed a nervous syndrome. Pathological examination was made on 36 infected chickens of 9 flocks.
1. Typical gross lesions of Asian type ND were observed in non-vaccinated flocks. On the other hand, characteristic central-nervous-system (CNS) lesions occurred in the vaccinated flock.
2. CNS lesions were found in the cerebral hemispheres, midbrain, cerebellum, and medulla oblongata. Disseminated non-purulent encephalitis was accompanied by primary or secondary necrotic foci.