Modelling the impact of a combined varicella and zoster vaccination programme on the epidemiology of varicella zoster virus in England


van Hoek, AJ; Melegaro, A; Zagheni, E; Edmunds, WJ; Gay, N; (2011) Modelling the impact of a combined varicella and zoster vaccination programme on the epidemiology of varicella zoster virus in England. Vaccine, 29 (13). pp. 2411-2420. ISSN 0264-410X DOI: 10.1016/j.vaccine.2011.01.037

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Abstract

This study updates previous work on modelling the incidence of varicella and Herpes Zoster (HZ) following the introduction of childhood vaccination. The updated model includes new data on age-specific contact patterns, as well as data on the efficacy of zoster vaccination in the elderly and allows for HZ among vaccinees. The current study also looks at two-dose varicella childhood programmes, and assesses the combined impact of varicella vaccination in childhood and zoster vaccination of the elderly. The results suggest that a two-dose schedule is likely to reduce the incidence of varicella to very low levels, provided first dose coverage is around 90% and second dose coverage is in excess of 70%. Single dose varicella vaccination programmes are expected to result in large numbers of breakthrough cases. Childhood vaccination is expected to increase the incidence of zoster for more than 40 years after introduction of the programme, the magnitude of this increase being influenced primarily by the duration of boosting following exposure to the varicella zoster virus. Though this increase in zoster incidence can be partly offset by vaccination of the elderly, the effectiveness of this combined strategy is limited, as much of the increase occurs in those adults too young to be vaccinated. Childhood vaccination at intermediate levels of coverage (70% and 60% for first and second dose coverage respectively) is expected to lead to an increase in adult varicella. At high coverage (90% and 80% coverage) this is unlikely to be the case. These results will be used to inform a cost-effectiveness analysis of combined varicella and zoster vaccination programmes. (C) 2011 Elsevier Ltd. All rights reserved.

Item Type: Article
Keywords: Herpes Zoster, Varicella zoster, Infectious disease modelling, Shingles, Chickenpox, Vaccination, HERPES-ZOSTER, COST-EFFECTIVENESS, HEALTHY-CHILDREN, SOCIAL CONTACTS, UNITED-STATES, IMMUNIZATION, RECOMMENDATIONS, CHICKENPOX, ADULTS, PREVENTION
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Vaccine Centre
PubMed ID: 21277405
Web of Science ID: 289140500010
URI: http://researchonline.lshtm.ac.uk/id/eprint/908

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