Hi, i just want to correct one or two things on here (I study immunology and an active research scientist). The link to a chickenpox vaccine increasing the risk of shingles is pretty weak. In the US they've seen the number of cases fall for a number of years and had the vaccine on two dose since 2006. In Germany, they've not seen a rise in shingles and again they have a vaccination programme that includes the chickenpox vaccine. Additionally, people over a certain age can get a shingles vaccine for free here.
There is no evidence of the vaccine wearing off. Again data from the US going back to the 1990's when they introduced the once dose programme show that immunity is still going strong, up in the 90%'s after 20 years. People can get a boost if they like, but if chickenpox is in the wild, they will just boost immunity by being exposed. If we vaccinate all kids, then well it's not in the wild so not needed.
I have personally vaccinated my DS. Mainly because i saw a friend's DS end up in hospital due to infections of the scabs. I've even heard of some children dying from it after doing research into it. Although the disease is mild for most, when it isn't it can be very serious. I'm not taking that risk, and why let my DS be ill for a week anyway?
Problem is if we all vaccinate privately, those who don't may catch the disease later in life as they've not been exposed to it and it's not circulating in the wild. This can be more serious. So i hope they introduce a vaccine on the child immunisation schedule soon. But if you're looking after number 1, i'd do it.