Keyword: Zostavax


2. Merck & Co.

While immuno-oncology star Keytruda has generated plenty of headlines for Merck lately, the company's vaccine business has been on the upswing, too, thanks to human papillomavirus shot Gardasil 9.

6. Merck & Co.

Like any global drugmaker, Merck faced a bevy of challenges in 2017, a year marked by meager growth for the company. Still, there are bright spots in the company's performance, mostly immuno-oncology star Keytruda, and that's continuing to pay off in 2018.