The following video is part of our "Motley Fool Conversations" series, in which health-care editor/analyst David Williamson discusses topics across the investing world.

In this video, David discusses why the market is wrong about Vertex Pharmaceuticals. Shares plunged over 10% after the company restated the results of its recent trial combining Kalydeco with VX-809 to treat cystic fibrosis. Watch and find out two reasons the sell-off was overblown and why Vertex has a lot going for it. Fool on!

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David Williamson has no positions in the stocks mentioned above. The Motley Fool has no positions in the stocks mentioned above. Motley Fool newsletter services recommend Gilead Sciences, Novartis, and Vertex Pharmaceuticals. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.