Elsevier

Journal of Infection

Volume 67, Issue 5, November 2013, Pages 463-469
Journal of Infection

A population based study of the epidemiology of Herpes Zoster and its complications

https://doi.org/10.1016/j.jinf.2013.06.016Get rights and content

Summary

Objectives

To assess the incidence of Herpes Zoster (HZ) and its complications in the Israeli general population and specifically in immune-compromised individuals, and to identify risk factors for developing HZ and post-herpetic neuralgia (PHN).

Methods

A retrospective database search for newly diagnosed cases of HZ and of PHN during 2006–2010 was conducted using the comprehensive longitudinal database of Maccabi Health Services. Cox-proportional hazards models were used to assess associations between risk factors and HZ and PHN.

Results

During 2006–2010 there were 28,977 newly diagnosed cases of HZ and 1508 newly diagnosed cases of PHN. Incidence density rate of HZ was 3.46 per 1000 person-years in the total population and 12.8 per 1000 person-years in immune-compromised patients. HZ and PHN incidence increased sharply with age. 12.4% and 3.1% of elderly HZ patients (≥65 years) developed PHN or ophthalmic complications, respectively. In multivariable analyses, HZ and PHN were associated with female sex, higher socioeconomic status, diabetes mellitus, cancer history, and HIV treatment.

Conclusions

Extrapolating to the entire Israeli population, we estimate over 24,000 new cases of HZ and 1250 new cases of PHN each year. Cost-effectiveness analysis should be performed to determine the threshold age for vaccination against HZ.

Introduction

Herpes Zoster (shingles) is caused by varicella-zoster virus (VZV) reactivation, often several decades after the initial infection, and is characterized by painful dermatological symptoms. According to previous studies from the UK, Canada, and the USA the lifetime risk of developing HZ is 20%–30%.1, 2 Incidence increases markedly with age and is higher among patients with neoplastic diseases (especially lymphoproliferative cancers), organ-transplant recipients, and in those receiving immunosuppressive drugs, due to impaired cell-mediated immunity in these patients. The most common complication of HZ is post-herpetic neuralgia (PHN), a persistent pain that negatively affects the patient's quality of life and ability to function.3 Precise definitions of PHN vary, but most authors use persistent pain for 1–3 months after the outbreak of the HZ rash.4, 5, 6, 7

HZ vaccine has been shown to substantially reduce the risk of HZ and subsequent PHN in immune-competent elderly subjects.8 The vaccine is licensed for use in the USA since 2006 and recommended in persons aged 60 years or above with no contraindications, such as primary or acquired immunodeficiency.9 Despite lack of updated local data regarding the epidemiology of HZ, an advisory committee to the Israeli Ministry of Health has recently recommended immunization for elderly citizens. We undertook the present study to evaluate the incidence of HZ and its complications in the Israeli general population and among specific high-risk groups, as well as to assess the proportion of under-diagnosed HZ cases in the community. In recent years, use of biological immune-suppressants in Israel has increased due to inclusion of several new indications in the Israeli basket of health services.10, 11 Therefore we divided the analyses into two different time-periods: Incidence rates of HZ and PHN in the general population were derived for the years 2006–2010, whereas high-risk populations and complications other than PHN were studied during 2010.

Section snippets

Data source and case definition

The present retrospective cohort analysis was conducted using the comprehensive longitudinal database of Maccabi Healthcare Services (MHS), the second largest health maintenance organization (HMO) in Israel, covering approximately 2 million individuals, or 25% of the total Israeli population. Since 1995, all Israeli citizens are universally covered under the 1994 National Healthcare Insurance Act that provides a comprehensive basket of services through four national HMOs. The age and sex

Epidemiology of HZ and PHN during 2006–2010

During the study period there were 28,977 newly diagnosed cases of HZ and 1508 newly diagnosed cases of PHN among MHS members (Table 1). The IDR of HZ was 3.46 per 1000 person-years with a sharp increase with age, ranging from 2 per 1000 person-years among children and young adults to 10 per 1000 person-years among the elderly (≥65 years of age). There was little variation in the annual IDR of HZ during the study period (Fig. 1). The mean age at diagnosis increased linearly from 43.3 years in

Discussion

The results of this population based cohort indicate a substantial annual risk of HZ of about 4.5 per 1000, with one in twenty HZ patients further developing PHN. Similar to previous studies, we found a strong association between age and occurrence of HZ2, 4, 5, 6, 7, 16, 17, 18, 19, 20 and of PHN.4, 5, 6, 7, 20 Our analysis provides further evidence of the importance of well-known HZ risk factors such as female sex,6, 7, 16, 17, 21, 22 diabetes,13, 20, 23 and immunocompromised conditions.7, 16

References (39)

  • M. Brisson et al.

    Epidemiology of varicella zoster virus infection in Canada and the United Kingdom

    Epidemiol Infect

    (2001 Oct)
  • R.S. Chapman et al.

    The incidence of shingles and its implications for vaccination policy

    Vaccine

    (2003 Jun 2)
  • R.W. Johnson et al.

    The impact of herpes zoster and post-herpetic neuralgia on quality-of-life

    BMC Med

    (2010)
  • W. Opstelten et al.

    Herpes zoster and postherpetic neuralgia: incidence and risk indicators using a general practice research database

    Fam Pract

    (2002 Oct)
  • B.P. Yawn et al.

    A population-based study of the incidence and complication rates of herpes zoster before zoster vaccine introduction

    Mayo Clin Proc

    (2007 Nov)
  • A. Gauthier et al.

    Epidemiology and cost of herpes zoster and post-herpetic neuralgia in the United Kingdom

    Epidemiol Infect

    (2009 Jan)
  • L.E. Gialloreti et al.

    Epidemiology and economic burden of herpes zoster and post-herpetic neuralgia in Italy: a retrospective, population-based study

    BMC Infect Dis

    (2010)
  • M.N. Oxman et al.

    A vaccine to prevent herpes zoster and postherpetic neuralgia in older adults

    N Engl J Med

    (2005 Jun 2)
  • R. Harpaz et al.

    Prevention of herpes zoster: recommendations of the Advisory Committee on Immunization Practices (ACIP)

    MMWR Recomm Rep

    (2008 Jun 6)
  • A. Israeli

    Health ministry director-general circular no. 21/08: expansion of health services basket for 2009

    (2010)
  • E. Chai-Am

    Health ministry director-general circular no. 02/10: expansion of health services basket for 2010

    (2010)
  • J. Bendelac

    Membership in sick funds 2010

    (2011)
  • A.D. Heymann et al.

    Diabetes as a risk factor for herpes zoster infection: results of a population-based study in Israel

    Infection

    (2008 Jun)
  • 1995 census of population and housing

    (1998)
  • G. Chodick et al.

    The epidemiology of diabetes in a large Israeli HMO

    Eur J Epidemiol

    (2003)
  • R.P. Insinga et al.

    The incidence of herpes zoster in a United States administrative database

    J Gen Intern Med

    (2005 Aug)
  • S.L. Thomas et al.

    What does epidemiology tell us about risk factors for herpes zoster?

    Lancet Infect Dis

    (2004 Jan)
  • J.G. Donahue et al.

    The incidence of herpes zoster

    Arch Intern Med

    (1995 Aug 7–21)
  • J.G. Pierik et al.

    Epidemiological characteristics and societal burden of varicella zoster virus in the Netherlands

    BMC Infect Dis

    (2012 May 10)
  • Cited by (91)

    • Viral Ocular Infections

      2022, Encyclopedia of Infection and Immunity
    View all citing articles on Scopus
    View full text