One of the things no one seems to have brought up yet about vaccines is the 
aspect of what is called shedding.
I remember when the media was hyping the threat of bird flu reading an article 
that said if you started massive vaccination for bird flu, you would get more 
bird flu. After you get the shot supposedly you can shed the disease actively 
for so long. Or at least some can and do. That was a scarey thought to me.
Paula