First of all, the zombie apocalypse would only last for 2 minutes before every single one of them were shot dead. Every hardcore gamer, gun-owning braggart, and conspiracy crackpot would have been preparing for that moment their whole lives.
Second of all, unless is was some sort of extremely powerful parasite that replaced the entire human body as we know it, it would be nigh impossible to rescuccitate a dead human body via parasitism.
Third of all, Viruses are incapable of being so coordinated that they could control, even as loosely as a shambling uncanny-valley zeds we know today, a human body. Viruses are hardly even alive to begin with, they can't move on their own, and reproduce by chance encounters that the pointy end finally manages to hit a cell membrane/wall. Same thing goe to bacteria, which are likely incapable of figuring out what they're doing. They have a better chance of fucking with brains like zombies being rabies rather than the primitive zombie approach.
If a zombie apocalypse DID break out, and nothing happened, then I'd learn to be a fucking necromancer/lich and have a spectacular zombie war.
and @Firewing, as far as it being psychologically difficult to bring yourself to kill a zombie, while your brain does register it as a human being, it also registers the zombies in your social out-group. The out-group is generally considered by the caring part of the brain as a bunch of strangers and automatons that you needn't care about, and that if need be, you can blow their heads off with reckless abandon, and even feel free to hate them. Famous universal out-group members include: Ugly Hookers, Nazis, Communists, Xenomorphs, Really boring Teachers, School Bullies, terrorists, and other dislikable people.