In this video, Motley Fool health-care analyst David Williamson talks about some of the biggest investing stories in the health-care space today. He tells us about Pfizer (NYSE: PFE) and Bristol-Myers Squibb's (NYSE: BMY) latest European victory, a major insurance win for obesity-drug maker VIVUS (NASDAQ:VVUS), a huge vote of share-price confidence for Sarepta (NASDAQ: SRPT) and its drug for Duchenne muscular dystrophy, and a big tumble for St. Jude Medical (NYSE: STJ) after another problem with one of its products.