so it's more of a contagen sort of thing huh? something transferred through bite or blood. i guess using that as a theory might work. though, i can't think of any bacteria or anything else that might fit the profile.
and the "mutate" idea is good, but needs some more work than just saying that. remember, the current story is that werewolves have existed for a long time. a REALLY long time. so the idea of a lab experriment or radiation mutating the body of someone is a bit to recent of a possability.
i think a good origin idea is that werewolves sort of evolved alongside humans and have a gene that allows them to shift forms between that of a man and that of a wolf. the gene theory is possible, as there are animals in existance that change forms, albeit probably not at will (ex: caterpillar/butterfly, maggot/fly, and here's an interesting one grasshopper/locust). and it could be feasable that the gene could be transferred to others. we're actually experimenting on gene therapy right now, so isn't it possible that nature could have evolved a working system on it's own? and it could be mistaken for a virus as it actually DOES change DNA by adding to it!
heh, i think i just came up with something good here that fits pretty well!
so here's the rundown, once more:
~Were-gene theory~
1) werewolves evolved alongside man
2) werewolves evolved a transferrable gene than can be moved from person to person through saliva or blood
3) this gene carries informatin that allows a human to change into a wolf and information to enhance associated traits
thanks to Lupin and vrikasatama for the inspiration!
~Celtwolf