Zombies: dont we just love em?

I don't think it is zombies people are afraid of, it is more so the virus that people are afraid of. Though this started off as a Hollywood movie concept, people are getting the urge that a zombie invasion could actually happen. The movie industry has changed the concept of a "zombie" many time until it transformed into what we recognize it as today; zombies are undead, flesh eating humans who do not have a conscious mind that they can control. As a result, scientist became interest in the concept of a "zombie". By creating a mathematic equation, scientist think they have a bit of an explanation for zombies. Considering I am not a science or mathematical major, the equation is gibberish to me. One thing I did notice is they assumed on a lot of variables which makes me slightly question if a zombie invasion will ever happen. They concluded from the equation that, if zombie invasion ever happened we will have to aggressively attack the virus and the undead in its early stages, even then it may still be disastrous. I would hate to see the collapse of civilization and the rise of a brave new world, but is this zombie invasion even worth fearing?