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