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Vaccine to Guard Against Dengue Fever Is Almost at Hand

Researchers are on the cusp of a commercially available vaccine to prevent dengue fever, a viral disease spread by mosquitoes that threatens half of the world’s population. In addition, a vaccine against the Zika virus, a close relative of dengue, will most likely enter clinical trials this year. The dengue virus infects an estimated 400 million people in 120 countries each year. While the symptoms, including a rash, are usually not serious, the disease nonetheless kills some 25,000...

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