D.M.
Hi M.---Why are you concerned about infection of your child has been vaccinated? Having said that, I have some thoughts.
I work with a Naturopath who shares at length about the ineffectiveness of vaccines, especially the chicken pox vaccine. Granted, cp is not very fun when your little one contracts it, but in the overall scheme of things, it would be much better for your child to contract chicken pox as a young child rather than find out that the vaccine didn't work. When adults contract cp, it can be life threatening. There have been many reports of vaccinated individuals getting cp anyway. I believe that the manufacturers are considering booster shots as they get older because of that.
Please visit the website www.nvic.org to learn more about the pros and cons. They have a very good website that shares the risks of the disease which can help you determine what to do. I would send mine to school. Your child has been vaccinated. If by some chance they catch cp, it's really not the end of the world. Your child will have better immunity by catching cp rather than from a vaccine.
I hope this helps. Good luck. D.