To expand on the defects in your WAG about shingles incidence (courtesy of the CDC):
*"Some scientists have suggested that exposure to varicella disease may boost a person’s immunity to VZV and reduce the risk for VZV reactivation as zoster. Some studies have shown reduced risk for zoster in adults who are exposed to varicella, but other studies have not shown this effect.[6-10]
In the years following implementation of the childhood varicella vaccination program in the United States in 1996, rates of varicella in children fell dramatically. This led some scientists to speculate that increases in zoster in adults were the result of widespread vaccination of children against varicella, because adults have fewer opportunities to be exposed to varicella disease in children. However, this seems increasingly unlikely.
A recent CDC study, using Medicare data from 1992 to 2010, found that among adults aged 65 years or older, zoster rates were increasing even before the varicella vaccine was introduced in the United States.[1] Moreover, zoster rates didn’t accelerate after the routine varicella vaccination program began.
We also examined whether there was a link between state varicella vaccination coverage and zoster rates. Zoster rates did not accelerate as states increased varicella vaccination coverage. In fact, zoster incidence was the same in states with consistently high vaccination coverage as it was in states with lower vaccination coverage.
Our study adds to a growing body of evidence showing that the increase in zoster rates is not a result of childhood varicella vaccination.[1,2,4,11]"*
There is a recent study which suggested a temporary link between chickenpox vaccination and increased shingles incidence in one limited age group. But it also found that re-exposure to chickenpox enhanced adults’ immunity for a much shorter period than previously believed (thus, the “booster” effect has been overstated).
*"A new model developed by the scientists also confounds previous findings on the length of time re-exposure chickenpox boosts immunity to shingles. The effect was thought to last for up to 20 years, but results of the current modeling study show it only lasts for two. The new model is the first based on real immunological and virological data from individuals.
“We were surprised to find that re-exposure to chickenpox is beneficial for so few years and also that the most pronounced effect of vaccination on increasing cases of shingles is in younger adults,” says lead author Dr Benson Ogunjimi.
“Our findings should allay some fears about implementing childhood chickenpox vaccination,” he says."*
And while there are some respectable voices in medicine that have concerns about the vaccine supposedly increasing shingles rates, this meme is also a favorite of antivaxers, as seen here.*
*the main researcher quoted, Gary Goldman, has an interesting history, as does his sometime collaborator, Neil Z. Miller (who talks to extraterrestrials in his spare time when he is not excreting new antivax books).