Plague Inc 2
The second game, denoted as Evolved, is an improved version from smartphones. It is now available on PC and is constantly updated and patched. The new chapter contains every basic and special disease, including Neurax Worm that controls and Necroa Virus that disables minds.
Also, you will find a Simian Flu that suppresses humans but raises the intelligence of monkey tribes, making them rise and spread all over the world instead. In short, there are lots of ways to experiment!