My initial post said there is not enough info on either side
Accepted vet vaccination protocol as it is however, has kept some horrendous diseases under control - there is irrefutable proof of this. The ill-effects directly attributable to boostering, though, haven't yet been proven. Anyway, this is going round in circles. All I meant to say was read as much as you can, talk to your vet and make a decision based on all the evidence linked to your own personal circumstances and perception of risk (I think I did say this somewhere!!)