In this Jan. 27, 2016 file photo, samples of Aedes aegypti mosquitoes, responsible for transmitting dengue and Zika, sit in a petri dish at the Fiocruz Institute in Recife, Pernambuco state, Brazil. (AP Photo/Felipe Dana, File)
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An experimental vaccine against dengue, the world's most common mosquito-borne virus, was 100 percent effective in early trials and could speed up the pace of a vaccine against Zika, researchers said Wednesday.Dengue – which is in the same family of flaviviruses as Zika – infects some 390 million people each year in more than 120 countries of the world.The vaccine candidate, known as TV003, was tested in a group of 48 people – half of whom received the vaccine, with the other half given a placebo.Six months after vaccination, the two groups were exposed to a weakened form of dengue serotype 2 virus, the hardest of the four dengue strains to prevent.This helped researchers identify the vaccine's effectiveness in people who had not been previously exposed to any strain of dengue.
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