Receiving a CP vaccine itself isn't necessarily the reason vaxed-for-CP teens have a higher rate of shingles. It may be because they are not re-exposed by their peers, or it may be because their immune systems are screwed up from receiving many vaccinations, or it may be something totally not vax-related, like junk food diet plus vitamin deficiency plus pesticide exposure.
the biggest thing that sets anyone up for shingles is unrelenting stress.
Yes, there is a much higher rate of shingles in vaccinated adolescents. I believe the reason for that is that the chickenpox disease gives a much more solid immunity - and I'm not just talking about antibodies, but innate immunity as well, which also "remembers" in the same way as antibodies do. The problem is that immunologists are still using the same tests as they did 60 years ago, and seem unable to see beyond that, therefore, they have no "tests" to test innate immunity.
If you find that unbelievable, read this: From Stanford University:
Back to the topic though. The antibody levels from the chickenpox vaccines are much lower than from the infection, and they drop much faster. Adolescences is a hugely stressful time with adjustments to puberty, lots of peer pressure and stress at school, and now with Iphones and lots of other avenues to be bullied from, the stress lives are much higher than even 30 years ago.
Here is one link which shows this - much to their surprise ... http://www.sciencedaily.com/releases/2012/03/120301143426.htm
when you are under huge stress, your innate immune system crashes, and no amount of antibodies matter. And if you don't believe me, then answer these questions:
Why do people with Herpes Simplex, who have constantly high levels of antibodies, constantly have break-outs? and why is there no vaccine for that?
Answer, because antibodies don't mean jack anything with HS. Only the innate immune system matters, and they know that a vaccine for HS would be useless.
And that's just the sort of storm, shingles thrives on. Lots of stress, suppression of front line immune system, and the Herpes Zoster - as it becomes called, come crawling out of the nervous system and makes hay while the person's defences are disabled
In the past, it was older people, going through "mid life crises" or other stressful events who got shingles. Now, the vaccine actually makes it easier for younger people to get it, because the immunity given by the vaccine, completely breaks the rules of solid immunity.