The more important thing to be looking at, is the risk of post operative infection, invasive fungal infections which kill more people after surgery than transplants do.
Um yeah thats what I said can't really fight disease with out an immune system.
You first post makes the ludicrous implication that all organs are infected w/some disease.
No I am making the assumption that you may wana have good immune system and not a chemically supressed one. Not going outside, eating lettuce, shushi, or having the liberty of acidentaly cutting your self is not fun.
You body's rejection is not due to the organ being infected, but simply not always being a perfect match.
Uh yeah. No duh. Thats what I said. It sucks if you have a "good" immune system that does its job and is very adept at recognizing foreign tissue. And God forbid you have had lots of blood transfusions that trains your immune system to look for other human tissue of that type and kill it (not blood type btw).
Which can be worked around with medications and drugs to shut off the body's assault on the new tissue
This is a god aweful bad thing in real life. And I really did not care about getting infections from organs you will most likely get infections from your enviroment. If running around with a suppressed immune system is so great why is HIV such a headliner? When you reject an organ you destroy it. Because there is no dip stick, gauge or idiot light to check when your body decides to lauch a sneak attack you can just break your brand new heart or lung or whatever. So a organ that was perfectly good is for the last six months since your transplant just got fried. So what do you do? YOu get another one, but guess what your body knows that for some reason various strains of human keep poping up on the radar. So the next transplant is even less likely to work.