Yeah, I realized while reading your comment that I had missed putting the important part of my thought in my post -- that it wasn't "fear of needles", it was "fear of vaccines". Just added it.

Right, I agree with the association between doctor and pain -- I was trying to take it to another level, that it's not only the pain of the needle, but the continuing pain from what was in that needle, and what it does to the developing child's body.