Should Abbott and DexCom Investors Be Worried About Vertex Pharmaceuticals?

Vertex might not present a clear and present danger to Abbott and DexCom but could present a clear future threat.Successful investors think about the future by focusing on what the new opportunities might be. They also pay attention to threats that could emerge that might impact the stocks they own. Sometimes, those threats come out of the blue, but other times, they're identifiable well in advance.If you own shares of Abbott (ABT -1.20%) or DexCom (DXCM 0.20%), there's a looming threat to know about. It's ...