Possibly, but it has not been established that childhood chickenpox vaccination lowers shingles rates decades later in adulthood. Vaccinated children in one large U.S. study had substantially lower shingles incidence than unvaccinated children. That finding does not tell us what their risk will be in old age. Studies tracking shingles trends among older U.S. adults have not shown a clear change tied to the childhood vaccine program, but those adults were not the childhood-vaccinated cohorts now being followed.
Why chickenpox vaccination could affect shingles
Chickenpox and shingles are caused by varicella-zoster virus (VZV). After chickenpox, the virus can remain latent in the body and later reactivate as shingles, also called herpes zoster. The CDC describes this connection.
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One proposed explanation for a possible effect on unvaccinated people is called exogenous boosting: contact with circulating chickenpox might temporarily boost immunity to VZV and delay shingles. If vaccination reduces circulation of the virus, that exposure could become less common. This is a plausible mechanism, not proof that the vaccination program increases shingles across a population.
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The key distinction is between shingles measured in vaccinated children, shingles trends among older adults, and effects that might occur in people who were not vaccinated. These are different populations and outcomes, so the results should not be treated as interchangeable.
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| Evidence | Population and period | Finding | What it can show |
|---|---|---|---|
| U.S. pediatric study, 2019 | 6,372,067 children in six integrated health systems; 2003–2014 | Incidence was 38 per 100,000 person-years among vaccinated children and 170 per 100,000 person-years among unvaccinated children—an observed 78% lower rate in the vaccinated group. Overall pediatric incidence declined 72% during the study period. | Shingles incidence in children during the observed years, not adult risk decades later. |
| U.S. Medicare study, 2013 | 2,848,765 beneficiaries older than 65; 1992–2010 | Age- and sex-standardized incidence rose 39%, from 10.0 per 1,000 person-years in 1992 to 13.9 in 2010. The rate of increase did not change significantly after childhood vaccination began. | Historical trends among older adults, whose childhoods largely predated the program—not direct follow-up of vaccinated children. |
| Systematic review and meta-analysis, 2019 | Studies of chickenpox vaccination and shingles, including nonvaccinated age groups | Found no conclusive evidence of a substantial population-level effect in nonvaccinated age groups. It estimated a very small increase in hospitalized cases among people aged 10–49: fewer than two additional cases per 100,000 people. | Evidence across studies and outcomes; it does not settle the eventual adult risk of childhood-vaccinated cohorts. |
What the older-adult trend does—and does not—mean
The Medicare study found that shingles incidence among people over 65 was already rising before the U.S. childhood varicella vaccination program began. It found no statistically significant change in the increase after the program’s introduction, and its adjusted analysis for 1997–2010 did not find an association between state-level vaccination coverage and incidence. The authors also noted limitations, including uncertain consistency in health-seeking behavior and uncertainty in disease coding. These findings argue against attributing that historical rise to the program, but they cannot predict the lifetime shingles risk of people vaccinated as children.
A separate analysis of U.S. observational databases covering 1991–2016 likewise concerns population trends, not decades-long follow-up of the childhood-vaccinated cohorts. The U.S. program began in 1996 with one childhood dose; a second dose was added in 2006. The analysis is indexed by PubMed. The vaccination-era cohorts and the older adults in early trend studies are not the same group.
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Does reduced chickenpox exposure increase shingles in unvaccinated people?
The proposed exposure effect has been examined in different ways, with results that answer different questions. The 2019 systematic review did not find conclusive evidence of a substantial population-level effect in nonvaccinated groups, although it estimated a small increase in hospitalizations among people aged 10–49. That estimate concerns hospitalized cases, not all shingles cases.
A UK self-controlled study found that household exposure to a child with chickenpox was associated with lower shingles incidence over the following two years. This is consistent with an exposure effect in that setting, but it does not demonstrate that childhood vaccination causes a population-wide increase in shingles. The study was published in the BMJ in 2020.
What is known about childhood vaccination in the United States now
The CDC recommends two doses of varicella vaccine for children, adolescents, and adults without evidence of immunity. It reports that chickenpox cases in the United States have fallen by more than 97% since the vaccination program began in 1995. Those facts establish a major reduction in chickenpox; they do not establish what shingles rates will be when childhood-vaccinated cohorts reach older ages. The CDC’s varicella vaccine safety page provides current U.S. vaccine context.
Varicella vaccination and shingles vaccination address separate prevention questions. Shingrix is a vaccine for preventing shingles; it is not the childhood chickenpox vaccine. See the CDC’s clinical overview of shingles.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unanswered
The direct evidence that would answer the headline’s long-term question is follow-up of people who received varicella vaccine in childhood as they age into adulthood and older age. The evidence summarized here does not establish whether their shingles risk decades later will be lower, higher, or similar to that of comparable unvaccinated cohorts. The pediatric comparison is encouraging for children, while older-adult population trends and studies of exposure address different groups and cannot fill that gap.
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