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  • Title: Induction of tetravalent protective immunity against four dengue serotypes by the tandem domain III of the envelope protein.
    Author: Chen S, Yu M, Jiang T, Deng Y, Qin C, Qin E.
    Journal: DNA Cell Biol; 2007 Jun; 26(6):361-7. PubMed ID: 17570760.
    Abstract:
    In the present study, the domain IIIs of all four dengue virus (DENV) serotypes were connected sequentially to construct the tandem domain III. The resulting DNA fragment was then cloned into pBAD/Topo ThioFusion plasmid. After induction, the Escherichia coli expression protein was purified and used to immunize BALB/c mice by subcutaneous route. The sera from mice immunized with the purified protein were confirmed to contain specific high antibody titers against DEN1, DEN2, and DEN4, and moderate antibody titer against DEN3. In suckling mouse model, 70% of the mice challenged with DEN1, DEN2, and DEN4 in combination with sera from mice immunized with the purified protein were protected, and 18% of the mice challenged with DEN3 in combination with the same sera were protected. Our data suggest that the tandem domain III of the envelope protein can be used as a potential tetravalent dengue vaccine based on a single antigen.
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