I'm making this a new post lest you inadvertantly missed my response to xracer's previous thread.
Your answer re. gamma globulin blew my mind. I'm one of those people who have no idea how they contracted hcv - none of the standard risk factors. BUT, in 1954, my brother had the measles and my pediatrician gave me GG, which didn't prevent measles but did significantly reduce the severity of my symptoms.
Anyway, I just googled gamma globulin and all I could find was articles on the dangers of intravenous GG. I believe I received it intramuscularly, at least as far as I can remember. Was intramuscular GG possibly contaminated enough to cause hcv? If so, this should most definitely be added to the list of risk factors - or better yet, there ought to be universal testing for everybody.