Repeat after me: Vaccines are Safe and Effective and have undergone rigorous and thorough testing prior to their release to the public.

Premature Vaccine Launch Has Deadly Repercussions
Michaeleen Doucleff | NPR
May 3, 2019

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At a Feb. 21, 2018, Philippine Senate hearing in Manila on deaths linked to the dengue vaccine, families brought photos of children who had been vaccinated.
Noel Celis /AFP/Getty Images

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, sparked national panic and fueled a massive measles outbreak that has already killed more than 355 people.