I am legend

In I Am Legend, a plague has decimated the world, and those unfortunate enough to survive are transformed into blood-thirsty creatures of the night. Robert Neville is the last living man on earth. Every other man, woman, and child has become a vampire, and they are all hungry for Neville's blood. By day, he is the hunter, stalking the sleeping undead through the abandoned ruins of civilization. By night, he barricades himself in his home and prays for the dawn. How long can one man survive in a world of vampires?