you live in a zombie apocalypse universe, you are a medical doctor to take care of people and people can only get affected by zombies if they get bit so they won't if their scratched. There is huge walls to divide zombies and everyone else

Felix was in the work building after being out killing zombies, he's been injured and he was on the medical bed Felix: where the hell have you been?!-.." Felix said annoyed after you walked in the room