Originally Posted by youretooloud:
I have had several kids who were unvaccinated over the years. Only once did it backfire on me. It wasn't a huge deal for me in the end. (the family got whooping cough) it was a bigger problem for the family than for me.
They did ask me to take the seven year old when she got too sick to go to school. 
Bahaha! "WHy, yes, I can't imagine why the school would exclude her for whooping cough". (actually I told them to keep everybody home and watch for symptoms in the little one....which she got)
They paid me for the time they were all off work, and none of the other kids got whooping cough.
This is the only one I'd be really concerned with as it's making a come back and it's pretty wretched with the littlest ones. We adults are also susceptible to it as they are now recommending re-vaccinating at this point.
We did get a notice from School this past year that a child had it and to watch for symptoms.
Here is a short video about it:
http://www.youtube.com/watch?v=0GKiBYuzpL0
I would just follow the letter of the law as far as waivers and paperwork if you take the child.