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. 2013 Dec 12:13:586.
doi: 10.1186/1471-2334-13-586.

Disease burden of herpes zoster in Sweden--predominance in the elderly and in women - a register based study

Marie Studahl  1 , Max Petzold, Tobias Cassel
Affiliations

Disease burden of herpes zoster in Sweden--predominance in the elderly and in women - a register based study

Marie Studahl et al. BMC Infect Dis. .

Abstract

Background: The herpes zoster burden of disease in Sweden is not well investigated. There is no Swedish immunization program to prevent varicella zoster virus infections. A vaccine against herpes zoster and its complications is now available. The aim of this study was to estimate the herpes zoster burden of disease and to establish a pre-vaccination baseline of the minimum incidence of herpes zoster.

Methods: Data were collected from the Swedish National Health Data Registers including the Patient Register, the Pharmacy Register, and the Cause of Death Register. The herpes zoster burden of disease in Sweden was estimated by analyzing the overall, and age and gender differences in the antiviral prescriptions, hospitalizations and complications during 2006-2010 and mortality during 2006-2009.

Results: Annually, 270 per 100,000 persons received antiviral treatment for herpes zoster, and the prescription rate increased with age. It was approximately 50% higher in females than in males in the age 50+ population (rate ratio 1.39; 95% CI, 1.22 to 1.58). The overall hospitalization rate for herpes zoster was 6.9/100,000 with an approximately three-fold increase for patients over 80 years of age compared to the age 70-79 group. A gender difference in hospitalization rates was observed: 8.1/100,000 in females and 5.6/100,000 in males. Herpes zoster, with a registered complication, was found in about one third of the hospitalized patients and the most common complications involved the peripheral and central nervous systems. Death due to herpes zoster was a rare event.

Conclusions: The results of this study demonstrate the significant burden of herpes zoster disease in the pre-zoster vaccination era. A strong correlation with age in the herpes zoster- related incidence, hospitalization, complications, and mortality rates was found. In addition, the study provides further evidence of the female predominance in herpes zoster disease.

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Figures

Figure 1
Figure 1
Age-stratified number of male and female patients in Sweden receiving antiviral prescriptions in the dosage used in herpes zoster treatment during 2006-2010.
Figure 2
Figure 2
Age-stratified annual hospitalization rates for herpes zoster disease as the primary diagnosis in males and females in Sweden during 2006–2010.
Figure 3
Figure 3
Annual age-specific mortality rate in patients with herpes zoster as the primary cause in Sweden during 2006–2009.
See this image and copyright information in PMC

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