PATHOLOGY OF BURSA OF FABRICIUS OF THE BIRDS VACCINATED WITH COMMERCIAL GUMBORO VACCINES

Abstract

Pathology of bursa of Fabricius of the birds vaccinated with commercial Gumboro vaccine was studied. The course of the study was six months from December/2009 to May/2010. A total of 20 flocks were recorded and these flocks were previously vaccinated with commercially available Gumboro vaccines. The vaccination schedule and the instruction of the vaccination were strictly followed as per producers. The samples of the bursae were collected from the birds submitted to the Pathology laboratory during necropsy as well as during the physical visit of the farms. The clinical signs including morbidity and mortality rate, gross morbid lesions, histopathological lesions including bursal lesion scores were also determined. An apparently normal flock was included to compare the results. The morbidity rate and mortality rate was around 100% and 7-40%, respectively. Gross morbid lesions and histopathological features of the bursa of Fabricius were as typical as the naturally Gumboro affected flock. Maximal bursal lesion score was found in these affected flocks.