The virus infects the heart. Im timelord, i have two.

The next user is a and that has been exposed to a zombie-ant fungi (look it up if you dont know what it is) spore and it begins growing immediatly.

But I am not an ant, so the fungi starts growing... ON THE ANTS AROUND ME!

 -U said I am a and, not an ant!

The next user is thrown into a star (a blue giant) and has no non-real life items/physics.

Fortunately, I happen to have a rocket powered by matter-antimatter annihilation reactions. I activate the engine, and fly away from the star.

The next user is an antimatter human who is trapped in a universe entirely made of matter. If you come into contact with any matter, you will die from the resulting reaction, or from the radiation produced.

Crocodile Dundee convinces me to stop.

The next user accidently fell from a cliff.

A supernova exploded 5 light years away from here some time ago, and now its radiation has reached the planet where i am, the co2 layer is so dense that stops the radiation from hitting me, but is disintegrated into carbon and oxygen, so i get air to breath :) , i don't think this is crazy fiction since gamma rays can separate atoms (or something like this)

The next user is a normal mortal naked human that was 1 light years away from that supernova, and now is hit by immense radiation that can vaporise you and create many cancers, if you survive, and you don't have high-tech to get out of the way, trying to float away is useless since the radiation will catch you, and you can't have a mutation that makes you radiation resistant.

Good thing there is an entire star between me and the supernova that acts as shielding from the blast.

The next user has all of the atoms in your body spontaneously undergo nuclear fusion.

And after the fusion, strangely these fused atoms spontaneously undergo nuclear fission into the same atoms they were before and went to the right places, since physics are strange enough to make me fuse, then they are strange enough for me surviving :P.

Next user is made of fissile uranium that is hit by neutrons, and there is no chance that more than 30% of you dont explode.

The 30% that does not explode contains my vitals.

The next user is irradiated by neutrons.