Abstract
SETTING: Six provinces in Vietnam where the DOTS strategy was introduced in 1989. OBJECTIVE: To assess the impact of improved tuberculosis (TB) control on TB epidemiology in Vietnam. METHODS: Data from the surveillance system in the period 1990-2003 were analysed to assess trends of notification rates and the mean ages of notified cases. Data from repeated tuberculin surveys in the period 1986-2002 were estimated to assess the prevalence of TB infection, the annual risk of infection and its trend using various cut-off points in those with and without bacille Calmette-Guérin (BCG) scar. RESULTS: Age-standardised notification rates in the period 1996-2003 declined significantly, by 2.6% to 5.9% per year, in five provinces. However, in four provinces notification rates in the age group 15-24 years increased significantly, by 4.5% to 13.6% per year, during this period. The mean age of newly diagnosed patients with smear-positive TB increased up to 1995 but decreased thereafter. The annual risk of TB infection showed a significant annual decrease (4.9% per year) in one province in surveys performed between 1986 and 1997, and in two provinces (6.6% and 4.7%) in surveys conducted between 1993 and 2002. CONCLUSION: These data suggest limited impact to date of the DOTS strategy in Vietnam.
Original language | English (US) |
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Pages (from-to) | 963-969 |
Number of pages | 7 |
Journal | International Journal of Tuberculosis and Lung Disease |
Volume | 10 |
Issue number | 9 |
State | Published - Sep 2006 |
Externally published | Yes |
Keywords
- Communicable disease control
- Disease notification
- Health surveys
- Tuberculin test
- Tuberculosis
- Vietnam
ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine
- Infectious Diseases