The virus infected 95% of people and made them crazy people who only think about tickling and tickle those who are not infected if they get caught. Zombies grab the victim and tickle them without caring about their own health. Zombies are very stupid, you can hide from them. Zombies are fast, just like an ordinary person, they can run and catch up with victims in order to tickle them. Sometimes there may be mutant zombies. Zombie mutations are aimed at tickling.