Editor's note: The following video incorrectly stated that a patient taking Incyte's drug Jakafi passed away from a fatal brain infection. The patient developed PML, but is still alive. The Fool regrets the error.
Shares of biotech Incyte (NASDAQ: INCY ) came down hard today, after news that the company's drug Jakafi may have weakened the immune system of one patient in the U.K. enough to allow a rare type of viral brain disease to take hold. In this video, Motley Fool health-care analyst David Williamson gives investors some advice that may temper their panic a bit.
While you can certainly make huge gains in biotech and pharmaceuticals, the best investing approach is to choose great companies and stick with them for the long term. The Motley Fool's free report "3 Stocks That Will Help You Retire Rich" names stocks that could help you build long-term wealth and retire well, along with some winning wealth-building strategies that every investor should be aware of. Click here now to keep reading.