Well, to a very certain extent as in in the form of viruses. Zombies are a sub-group of the undead which[undead]is described/defined as: [quote]An undead is a being in mythology, legend or fiction that is deceased yet [u]behaves as if alive[/u][/quote] A virus does in fact act as if it's alive by creating copies of itself but through the use of unaffected cells. But what else can show a virus possibly being a "zombie"? Take a quick look at this link: [url]http://www.wisegeek.com/what-is-the-definiton-of-life.htm[/url] [quote]Metabolism: Living organisms must be capable of converting energy in their environment into a new form. This definition is often given in much more scientifically-precise terms, to ensure the exclusion of pure-energy reactions such as stars.[/quote] From what I remember out of my 10th grade biology class, a virus does not have a metabolism so it's technically not living but at the same time it acts living by using healthy cells to copy itself. tl;dr a virus could possibly be considered a "zombie"