Association Between Herpes Zoster and Parkinson's Disease and Dementia: a Systematic Review and Meta-analysis
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Objectives: This meta-analysis investigated the relationship between herpes zoster and the risk of dementia or Parkinson's disease by analyzing published clinical studies.
Methods: We systematically searched PubMed, Cochrane, Embase, and Web of Science Core Collection databases on April 25, 2024. Hazard ratios (HR) were used for statistical analyses. Random-effects models were applied, and heterogeneity was assessed using the I statistic.
Results: Herpes zoster was associated with a non-significant trend toward increased dementia risk (HR = 1.11, 95% CI 0.99-1.24, = 0.07) but significantly increased Parkinson's disease risk (HR = 1.15, 95% CI 1.03-1.30, = 0.02). Subgroup analyses revealed that herpes zoster significantly elevated the risk of the prospective study subgroup (HR = 1.08, 95% CI 1.02-1.13, = 0.004) and vascular dementia subgroup (HR = 1.17, 95% CI 1.00-1.37, = 0.05). Significant heterogeneity was observed for both outcomes (dementia: = 98%, < 0.00001; Parkinson's disease: = 94%, < 0.00001).
Conclusion: Herpes zoster raises the risk of Parkinson's disease and vascular dementia, with a potential causal link to dementia. Early vaccination against herpes zoster is recommended over post-infection antiviral treatment to mitigate risks.
Systematic Review Registration: https://www.crd.york.ac.uk/PROSPERO/ and our registration number is CRD42024555620.