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NIH-developed candidate dengue vaccine shows promise in early-stage trial
Date:1/23/2013

A candidate dengue vaccine developed by scientists at the National Institutes of Health (NIH) has been found to be safe and to stimulate a strong immune response in most vaccine recipients, according to results from an early-stage clinical trial sponsored by the National Institute of Allergy and Infectious Diseases (NIAID), part of the NIH. The trial results were published online on January 17 in the Journal of Infectious Diseases.

Dengue fever, prevalent in many tropical and subtropical regions of the world, is caused by any of four related virusesDENV-1, DENV-2, DENV-3 and DENV-4 that are transmitted to humans by Aedes mosquitoes. The World Health Organization estimates that every year, 50 million to 100 million cases of dengue occur worldwide, resulting in 500,000 hospitalizations of patients with severe disease, many of them in children.

Infection with one dengue virus results in immunity to that specific virus but not to the other three. Research shows that the likelihood of severe disease increases when a person is subsequently infected with a different dengue virus. This observation suggests that the ideal dengue vaccine would be tetravalentthat is, protective against all four dengue viruses.

"The global burden of dengue is enormousand it is growing," said NIAID director Anthony S. Fauci, M.D. "We are cautiously optimistic about these recent clinical trial results with this candidate tetravalent vaccine developed at NIAID; however, much more work still needs to be done."

The Phase I clinical trial, launched in July 2010 and led by principal investigator Anna Durbin, M.D., at Johns Hopkins Bloomberg School of Public Health in Baltimore, tested a single dose of each of four versions of the investigational dengue vaccine TetraVax-DV. The vaccine was developed by scientists in NIAID's Laboratory of Infectious Diseases. It is a live, attenu
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Contact: Nalini Padmanabhan
padmanabhannm@niaid.nih.gov
301-402-1663
NIH/National Institute of Allergy and Infectious Diseases
Source:Eurekalert

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