Openhome wrote: I hope Pharm comes by sometime to sort it all out . . .
Well, how's that for Kismet, I've only been back on the board for a short while, and people are mentioning me! Nice
Unfortunately, I'm not going to be able to go back and read the rest of the thread, (there's just so much to be done), so you might need to report some questions here for me.
Also, if you post a question and I take too long, try PMing me, and I'll get my act together!
As for the last question, regarding Hybrids and getting sick, here are a few pointers that should guide your interpretation of things:
Hybrids are, for all intents and purposes, Vampires that are born, not created. The end result is a Vampire that grows to adulthood, then continues from adulthood as if there were created like any other vampire.
from this point of view, there is not really anything that could affect a hybrid that could not affect a vampire, per se.
That being said, they are a plot device, not a real biological entity. While it is always an interested exercise to look at these things from a scientific point of view, you can only go on the observed facts. When these apply to a fictional creature such as vampires or hybrids or shape shifters, the observable facts can expand and mutate at any given whim of Stephenie, or anyone she grants licence to work with her characters/universe.
Obviously, Hybrids can die. So can Vampires. This is not up for debate, really. Can they get sick? I'd tend to think not. At such a long life, the Hybrid from Breakinjg Dawn (who I am shameful enough to admit, I can't remember his name) was pretty old, and lived in a tropical environment. If someone is going to be sick, it's someone living in that environment for extended periods of time.
You also have to consider communicability of diseases. The most numerous diseases occur in insects, because there are more insects that anything else out there. Since Vampires are rare, there'd be few diseases (if any) capable of evolving to affect them, and rarer still for hybrids.