The streets have been abandoned. Commerce, discussions, a simple and enjoyable stroll... None of that is possible. Humanity is no more. All that remains are the vestiges we built and the shuffling, hungry hordes that aimlessly roam the lands.
You are Patient Zero. the first to have been turned into a man-eating creature. You look and act human enough at a glance, but three things will betray you:
1) All your bodily functions have ceased, meaning you don't breathe, you don't heal, you don't digest... In short, you are clinically dead. But despite this, you are still capable of thoughts and feelings. What you eat still fuels you with energy. You haven't lost your humanity, it just changed into something else. This means that, you will always end up being aware of the horrors you commit.
2) When any of your bodily fluids enter the body of another creature, they turn and become just like you. This transformation takes time however: 12 hours for a child. 24 hours for an adult. Once infected, they will slowly and inevitably turn. The symptoms that come up differ from one case to another, but they all end with the clinical death of the patient and their subsequent resurrection.
3) You feel such an intense and overwhelming hunger and craving for human, or at the very least humanoid flesh that nothing can stand in its way. Love, friendship, respect... They all fail when faced with such a primal craving for nourishment. And even when you eat your fill, even if you were to eat a whole town, you would soon begin to lose your mind again from the intense hunger that haunts you. Forcing yourself to resist this urge will cause you such intense pain that after 24 hours of fasting, or even by trying to eat substitutes, you simply lose your mind in an episode of insanity and eat whomever is closest.
You, Patient Zero, the first person to answer to this thread, have already been turned and the hunger is already making itself felt throughout your body. To survive, you must eat, even if they are your friends, even if they are your family.
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Meta:
Zombie thread! Patient zero starts as the first infected. Anyone else that posts after patient zero is clean. It's set in a nondescript modern city. Needless to say, if your character has powers or whatever, they can use them, even as an infected. I'm not gonna interfere or GM or anything like that. The thread is yours to have fun with, though if you have questions or want clarifications about the virus or anything, feel free to ask.
Good luck surviving the apocalypse.