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I too have not vaccinated my son. He is four now and has attended daycare [part-time] for the last two years; he has also been around lots of vaccinated kids. I have read that there is some danger in exposing vaccinated children to non vaccinated children. This is within the first 72 hours of the vaccinated child receiving shots. Particularily the live vaccines. However, the danger is in the bodily fluids [saliva, urine and feces] I'm not sure though how much of a danger this is. I think if you ensure your child's immunity [by not feeding
Sugar and increasing vit c] and cleanliness. You will be okay.
I got this information from the following link, within the website.
Vaccines