Limited impact of tuberculosis control in Hong Kong: Attributable to high risks of reactivation disease

Emilia Vynnycky, M. W. Borgdorff, C. C. Leung, C. M. Tam, P. E.M. Fine

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Over 50% of the global burden of tuberculosis occurs in South East Asia and the Western Pacific. Since 1950, notification rates in high-income countries in these settings have declined slowly and have remained over ten-fold greater than those in Western populations. The reasons for the slow decline are poorly understood. Using an age-structured model describing the incidence of Mycobacterium tuberculosis infection and disease applied to notification data from Hong Kong, we illustrate that in Hong Kong, a high prevalence of M. tuberculosis infection among older individuals and a high risk of disease through reactivation (e.g. up to 17-fold greater than that estimated for infected males in the United Kingdom) may explain this slow decline. If this feature of the epidemiology of tuberculosis is widespread, the WHO directly observed treatment short-course (DOTS) strategy may have a smaller impact in Asia in the short term than has been implied by recent predictions, all of which have been based on disease risk estimates derived from Western Europe. As a result, it may be difficult to meet the targets for tuberculosis control, which have been prescribed by the UN Millennium Development Goals.

Original languageEnglish
Pages (from-to)943-952
Number of pages10
JournalEpidemiology and Infection
Volume136
Issue number7
DOIs
Publication statusPublished - Jul 2008

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