The U.S. Food and Drug Administration just approved one of the most sought after vaccines in recent decades. It's the world's first vaccine to prevent dengue fever — a disease so painful that its nickname is "breakbone fever." The vaccine, called Dengvaxia, is aimed at helping children in Puerto Rico and other U.S. territories where dengue is a problem. But this vaccine has a dark — and deadly — history. One that has led to criminal charges in the Philippines, and sparked national panic. "In total, the deaths of about 600 children who received Dengvaxia are under investigation by the Public Attorney's Office, " the South China Morning Post reported last month.

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