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Published on: September 5, 2017
Annual risk of tuberculosis infection in West Sumatra Province, Indonesia
A Bachtiar1, T Y Miko, R Machmud
1Centre for Health Research, University of Indonesia, Jakarta, Indonesia.
Objective:
To estimate the annual risk of tuberculosis infection (ARTI) among children attending elementary school Classes I-III in West Sumatra Province, Indonesia.
Methods:
The survey was designed to estimate ARTI among children, irrespective of BCG scar status. Fieldwork was carried out in 72 schools selected by two-stage sampling. Children were administered 2 TU of purified protein derivative RT23 with Tween 80 intradermally on the mid-anterior aspect of the left forearm. The maximum transverse diameter of induration was measured at about 72 h. Analysis was carried out among 5653 satisfactorily test-read children aged 6-9 years.
Results:
The estimation by mirror-image method among all children (without and with BCG scar) revealed an ARTI of between 1% and 1.3%. The estimated ARTIs among children without and with BCG scar varied between 0.8-1.3% and 0.9-1.4%, respectively, using the mirror-image method, anti-mode method and mixture model.
Conclusion:
Tuberculosis control efforts need to be intensified to reduce the risk of transmission of infection.
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