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August 11, 2020; 95 (6) Article

Effect of herpes zoster vaccine and antiviral treatment on risk of ischemic stroke

Quanhe Yang, Mary G. George, Anping Chang, Xin Tong, Robert Merritt, Yuling Hong
First published July 7, 2020, DOI: https://doi.org/10.1212/WNL.0000000000010028
Quanhe Yang
From the Division for Heart Disease and Stroke Prevention, Centers for Disease Control and Prevention, Atlanta, GA.
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Mary G. George
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Anping Chang
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Xin Tong
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Robert Merritt
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Yuling Hong
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Effect of herpes zoster vaccine and antiviral treatment on risk of ischemic stroke
Quanhe Yang, Mary G. George, Anping Chang, Xin Tong, Robert Merritt, Yuling Hong
Neurology Aug 2020, 95 (6) e708-e717; DOI: 10.1212/WNL.0000000000010028

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Abstract

Objective To determine whether increased risk of acute ischemic stroke (AIS) following herpes zoster (HZ) might be modified by the status of zoster vaccine live (ZVL) vaccination and antiviral treatment following HZ.

Methods We included 87,405 Medicare fee-for-service beneficiaries aged ≥66 years diagnosed with HZ and AIS from 2008 to 2017. We used a self-controlled case series design to examine the association between HZ and AIS, and estimated incidence rate ratios (IRRs) by comparing incidence of AIS in risk periods vs control periods. To examine effect modification by ZVL and antiviral treatment, beneficiaries were classified into 4 mutually exclusive groups: (1) no vaccination and no antiviral treatment; (2) vaccination only; (3) antiviral treatment only; and (4) both vaccination and antiviral treatment. We tested for interaction to examine changes in IRRs across 4 groups.

Results Among 87,405 beneficiaries with HZ and AIS, 22.0%, 2.0%, 70.1%, and 5.8% were in groups 1 to 4, respectively. IRRs in 0–14, 15–30, 31–90, and 91–180 days following HZ were 1.89 (95% confidence interval [CI], 1.77–2.02), 1.58 (95% CI, 1.47–1.69), 1.36 (95% CI, 1.31–1.42), and 1.19 (95% CI, 1.15–1.23), respectively. There was no evidence of effect modification by ZVL and antiviral treatment on AIS (p = 0.067 for interaction). The pattern of association between HZ and risk for AIS was largely consistent across age group, sex, and race.

Conclusions Risk of AIS increased significantly following HZ, and this increased risk was not modified by ZVL and antiviral treatment. Our findings suggest the importance of following recommended HZ vaccination in prevention of HZ and HZ-associated AIS.

Glossary

ACIP=
Advisory Committee on Immunization Practices;
AIS=
acute ischemic stroke;
CI=
confidence interval;
CMS=
Centers for Medicare and Medicaid Services;
FFS=
fee-for-service;
HZ=
herpes zoster;
ICD-9-CM=
International Classification of Diseases, 9th revision, Clinical Modification;
ICD-10-CM=
International Classification of Diseases, 10th revision, Clinical Modification;
IRR=
incidence rate ratio;
MEDPAR=
Medicare Provider Analysis and Review;
RZV=
recombinant herpes zoster vaccine;
SCCS=
self-controlled case series;
ZVL=
zoster vaccine live

Footnotes

  • Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • Received April 18, 2019.
  • Accepted in final form February 11, 2020.
  • © 2020 American Academy of Neurology
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