DETECTION OF MATERNALLY DERIVED ANTIBODIES (MDA) TITER AND COMPARISON OF INTERMEDIATE AND INTERMEDIATE PLUS (GM-97 STRAIN) VACCINES OF INFECTIOUS BURSAL DISEASE VIRUS: Comparative Antibody titer of Intermediate and Intermediate Plus (GM-97 strain) Vaccines of IBDV

The Infectious Bursal disease (IBD) is an important devastating disease among the infectious diseases of poultry in Bangladesh. Hence, this study was designed to determine the MDA titer and compare the two commercially available vaccines strains of IBDV (“GM-97 strain Intermediate plus” and “Intermediate type strain”). In this study, a total of 1500 layer birds were equally allocated into three groups (group-A, group-B and control). The Group-A and Group-B were vaccinated by “GM-97 strain Intermediate plus” and “Intermediate type strain” of IBD vaccine, respectively and control was unvaccinated. Blood samples were collected prior to vaccination (1- and 7-days old birds), as well as 7, 14, and 21 days after vaccination. The antibody titer was measured by iELISA test. The highest MDA mean titer was 6227.69±327.63 in day-old birds. The group-A birds had the significantly (p