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ABSTRACT Immunization has a great impact on the economics of poultry production than all other therapeutic and prophylactic treatment combined and that even with the significant advancement in modern medicine, vaccination may become a feasible control alternative (Emery and Wagland 1993). Vaccine holds the key for indication of any disease through immunization. The present study comprises immunization by conventional vaccines through transfer of sensitized antibody forming cells of bursa against GI nematode-A galli. B-lymphocytes (mature in bursa of fabricious) are precursor of plasma cells which synthesize and release immunoglobulins. The B-lymphocytes have easily detectable immunoglobulins on cell membrane. These cells act as specific antigen recognizing system and react accordingly against antigens of A. galli. Weight of the bursa is effective method to find out the status about the proliferation of B cell in BOF of the chick. After passive immunization it has been noticed that the weight of the bursa does not show any significant change while at the time of sensitization, the size of the bursa effectively increased. Immunopathological studies were also performed for getting the confirmed information according to experimental design. So passive immunization can be a effective tool or the preventive measure for suppression of the A.galli infection in chicks.