Very interesting
"The Health Protection Agency has reviewed blood tests which showed higher levels of infection among children than originally thought.
In hotspot areas, such as London and the West Midlands, a third of school-aged children may have had the virus, but only one in 10 or less got ill."
If private clinics would screen individual children for a fee, then I'm sure lots of parents would take it up to save them the anguish of deciding whether to immunise or not.