Here you are, trapped inside your bedroom with nothing but a can of Cream of Mushrooms soup and a butter knife, while swarms of ravenous, flesh eating zombies congregate in your driveway. How could you have been so dumb? Months before this undead outbreak, you laughed at a blog post that warned you of such events. How foolish. The zombie apocalypse can exist my friend. Heed my warning, and start hoarding as much canned goods and water as you can.
Of course the dead cannot come back to life (mitosis ceases, thus no regeneration of dead cells), but if you know your zombie movies, many types of zombies were never dead (ie. 28 Days Later, World War Z, Quarantine). Increased aggression and an aptitude to kill seem to be the reigning characteristics of a zombie, which happen to be the symptoms of an all too familiar virus: Rabies. While yes, this aggression is only displayed temporarily in humans before they die an excruciating death, scientists have proven that the longevity of a person affected by rabies can increase easily with the help of evolution (a slow but possible route), or the help of naïve, yet capable virologist.
Of course, the worst way to spread a virus is through bite, which would appear to be the downfall of my argument. WRONG. It may be difficult, but virologists say that rabies, theoretically, can be hitched with an airborne virus, such as influenza, and can cause the worst pandemic of all time: a true Rage Virus. Not only could a random stranger maul you on the elevator, but you could also get infected by an infant’s cough. Now it is up to you to start preparing for the inevitable zombie invasion. If I were you, I would get a flu shot.