JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Immunogenicity of sanofi pasteur tetravalent dengue vaccine.

A candidate tetravalent (TV) dengue vaccine based on the yellow fever (YF) 17D vaccine has been developed by sanofi pasteur. This dengue TV vaccine induced a controlled dendritic cell stimulation in vitro. In clinical trials, Th1 and CD8 responses were induced with an IFN-gamma/TNF-alpha ratio favouring IFN-gamma in both cases, regardless of whether the vaccine recipients were flavivirus naive or not. There was an absence of Th2 response in all cases. The Th1 response was dominated by the D4 serotype in flavivirus naive individuals after initial vaccination but broadened to include all serotypes after second vaccination. This broadened response was also observed after primary dengue TV vaccination in subjects previously administered monovalent live-attenuated dengue 1 and dengue 2 vaccines. Notably, virtually no cross-reactivity between YF 17D and dengue NS3 antigens at the CD8 level was observed. Clinical and pre-clinical results support the favourable immunogenicity and short-term safety of the dengue TV. Future studies will establish the longevity of the vaccine-induced immunity and requirements for boosters.

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