When I was a kid I was pretty sick. I had a family doctor, and pediatrician specialist, and a on call doctor in the children's hospital. When it came time to get my vaccinations the family doctor told my mom to take me to the pediatrician, and the pediatrician said go see the hospital doc. Hospital doc said oh you have to go to the family doctor. Round and round it went till the pediatrician fessed up and said no of them wanted to do it because they were all worried about complications. As a result I've never been immunized.
As a side note an article I remeber reading about shingles.
http://www.news-medical.net/news/2005/09/01/12896.aspx
Maybe some of the people who know more than I could comment on it.