Does herpes zoster predispose to giant cell arteritis: a geo-epidemiologic study
Received 17 September 2017
Accepted for publication 6 December 2017
Published 11 January 2018 Volume 2018:12 Pages 113—118
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Scott Fraser
Edsel B. Ing,1,2 Royce Ing,2 Xinyang Liu,3 Angela Zhang,1 Nurhan Torun,4 Michael Sey,5 Christian Pagnoux6
1Ophthalmology and Vision Sciences, University of Toronto, Toronto, ON, 2Toronto Eyelid Strabismus & Orbit Surgery Clinic, Toronto, ON, Canada; 3Department of Medicine, Internal Medicine, Fudan University, Shanghai, China; 4Ophthalmology, Harvard Medical School, Boston, MA, USA; 5Department of Medicine, Western University Schulich School of Medicine, London, ON, 6Vasculitis Clinic, Rheumatology, Mount Sinai Hospital, Toronto, ON, Canada
Purpose: Giant cell arteritis (GCA) is the most common systemic vasculitis in the elderly and can cause irreversible blindness and aortitis. Varicella zoster (VZ), which is potentially preventable by vaccination, has been proposed as a possible immune trigger for GCA, but this is controversial. The incidence of GCA varies widely by country. If VZ virus contributes to the immunopathogenesis of GCA we hypothesized that nations with increased incidence of GCA would also have increased incidence of herpes zoster (HZ). We conducted an ecologic analysis to determine the relationship between the incidence of HZ and GCA in different countries.
Methods: A literature search for the incidence rates (IRs) of GCA and HZ from different countries was conducted. Correlation and linear regression was performed comparing the disease IR of each country for subjects 50 years of age or older.
Results: We found the IR for GCA and HZ from 14 countries. Comparing the IRs for GCA and HZ in 50-year-olds, the Pearson product-moment correlation (r) was -0.51, with linear regression coefficient (β) -2.92 (95% CI -5.41, -0.43; p=0.025) using robust standard errors. Comparing the IRs for GCA and HZ in 70-year-olds, r was -0.40, with β -1.78, which was not statistically significant (95% CI -4.10, 0.53; p=0.12).
Conclusion: Although this geo-epidemiologic study has potential for aggregation and selection biases, there was no positive biologic gradient between the incidence of clinically evident HZ and GCA.
Keywords: epidemiology, shingles, temporal arteritis, immunopathogenesis
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