Arulmozhi, A.Balasubramaniam, G.A.Doraisamy, K.A.Gopalakrishnamurhty, T.R.Sivaseelan, S.Srinivasan, P.TANUVAS2018-04-232018-04-232018-04http://krishikosh.egranth.ac.in/handle/1/5810044336TNV_IVJ_2018_95(4)50-52Fifteen, White Leghorn layer chick carcasses and  ve ailing birds aged 4 weeks were presented at the Department of Veterinary Pathology, Veterinary College and Research Institute, Namakkal for clinical and post-mortem examination with the history of regular mortality. The ailing chicks exhibited ruf ed feathers, somnolence and greenish diarrhoea. Grossly, there were no typical lesions except haemorrhagic bursa. Histopathologically, there were severe lymphocytic depletion, central follicular necrosis and haemorrhages. The bursae samples showing lesions were positive for AGPT against IBD known serum. But the typical lesions of IBD viz. heamorrhage in the thigh, breast muscle, gizzard - proventriculus junction and renal lesions were totally absent. Hence, the present study was undertaken to study the atypical form of IBD in laying chicks which also causing high mortality.enVeterinary ScienceArticle