The work was performed to investigate the efficacy of Salmonella bivalent vaccine containing Salmonella gallinarum and Salmonella pullorum in Shaver brown chicken.Birds were immunized at 7 weeks of age with 0.5ml (4.7 x107CFU/ml) of the bivalent vaccine followed by administration of a booster dose after 35 days of primary vaccination.At 3 weeks of primary vaccination, mean PHA antibody titre of sera samples were recorded as 104.00 11.71 with S. gallinarum antigen and 112.00 10.47 with S. pullorum antigen.Serum obtained at 5 weeks post primary vaccination (WPV) the mean PHA antibody titres...