Dengue is a viral infection spread by mosquitoes that infects over 390 million people annually and causes 21,000 deaths, mainly in tropical and subtropical regions. Dengvaxia is the first approved dengue vaccine, produced by Sanofi Pasteur for individuals ages 6-16 who have had a previous dengue infection. It requires three doses over one year and provides protection against the four dengue virus serotypes. Common side effects include headache, injection site pain, malaise, and myalgia.