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Evaluation of DNA vaccines encoding M. Tb gene Bfrb and Mpt32 in mice model.

Tuberculosis (TB) is a life threatening infectious disease which is prevalent throughout the world. Mycobacterium bovis based Bacille Calmette-Gue´rin (BCG) is the only vaccine available against TB however, this (single) vaccine is not enough to eradicate it. Furthermore, numbers of researches from different parts of the World have shown its efficacy as variable. Hence other (better) vaccines like DNA vaccines are needed in addition to BCG in order to achieve desired goal of TB eradication. The current study was aimed to develop subunit based DNA vaccines against TB and to check their efficacy. Two constructs Bfrb-pND14 and Mpt32-pND14 were made and used as DNA vaccines. Endotoxin free DNA preparations were made and used in immunization studies. Twenty Balb/c female mice of age eight weeks were used in trial. Two experimental groups each comprising eight animals were used to inoculate Mpt32-pND14 and Bfrb-pND14 vaccines respectively. A group of four animals was used as negative control. Animals were bled through tail periodically and finally through cardiac puncture before euthanization. Antibodies were confirmed through dot blot and Agar Gel Immuno Diffusion test (AGID). All the animals immunized with both vaccines were found positive as tested through dot blot and AGID. The results of this study have indicated that both the M. tb genes have produced strong immune response in mice model through pND14 vector and proved themselves as good subunit based DNA vaccines.