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TetraVax-DV is a live attenuated tetravalent dengue vaccine developed by the National Institute of Allergy and Infectious Diseases (NIAID) at the National Institutes of Health (NIH). It is designed to provide protection against all four dengue virus serotypes (DENV-1, DENV-2, DENV-3, and DENV-4). The vaccine consists of four recombinant dengue virus strains (rDEN1Δ30, rDEN2/4Δ30, rDEN3Δ30/31, and rDEN4Δ30) attenuated primarily through a 30-nucleotide deletion in the 3'-untranslated region of the viral genome. Two primary formulations have been evaluated: TV003, which contains equal amounts (10³ PFU) of each serotype, and TV005, which features an increased dose (10⁴ PFU) of the DENV-2 component to enhance immunogenicity. The vaccine is administered as a single subcutaneous dose and has been licensed to several global manufacturers, including Instituto Butantan (as Butantan-DV), Panacea Biotec, and Merck, for late-stage development and commercialization.
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