vaccines

[dingo]

I was called by the Center for Disease Control from the University of Chicago to answer a poll. They said I was chosen at random. That is questionable; although I answered this time, my caller ID indicated previous attempts by them. My children had enjoyed exemptions because of medical reasons in years past. They asked me how many children in my household don't have a FULL set of vaccinations. I could honestly answer , "Zero", since we are now empty nesters.

How common is this now? How likely is it that I was selected at random?