You hack at your leg cutting the infection off, the last thing you see is soldiers running towards you before you pass out from blood loss.
You awake in a infirmary with a bandaged stump where your left leg should be. Military men come in telling you its time to go a plane has arrived has come. you are moved In a wheelchair into the back of a cargo plane and it takes off landing alaska, you are given government housing and live your life without a leg, you write a book about your experiences and become a Millionaire. Where the infection was raging had been nuked. Humanity survived but lives were lost.
YOU LIVED ! :)