Fluu is a biohazard who's goal is to infect the world but secretly, those who get infected turn into zombies who still act like their normal selves but are a hivemind connected to Fluu, if she knows you know shit you're not suppose to. its predator after 
prey type of stuff, she tries to infect you the more you discover her schemes, takes only one cell from her to infect you, can assimilate or consume someone to infect them, tries to hide the fact that they are a biohazard and not get caught