Wikipedia was no help; I tried looking up "blood-borne disease", STDs and so forth, but got nothing useful. Google was similar.
Basically, I want lycanthropy to be transmitted via blood and saliva; I was going for a semi-scientific explanation of how it can be spread via bite. However, I don't want it to be transmissible through all bodily fluids; even if I didn't mind turning it into a STD, I'm already planning for it to be possible for werewolves to reproduce with humans, and that obviously wouldn't happen if sexin' the werewolves turned humans into more werewolves. Is it medically possible for that to happen?