Abstract
The objective of this study was to determine the tuberculin skin test conversion rate, as well as the course and outcome of the converters, among employees of a tertiary care hospital. The study is a retrospective, cohort descriptive study undertaken at the King Faisal Specialist Hospital and Research Centre, in Riyadh, Saudi Arabia. The study was undertaken over a four-year period from 1993 to 1996, and the subjects were employees who had annual screening PPD skin tests. The outcome measures skin test conversion, prophylactic treatment with isoniazid (INH), side effects, and development of clinical tuberculosis. A total of 6883 tuberculin skin tests were performed during the study period. The mean annual conversion rate was 1.55%. About 78% of the converters received INH prophylaxis, but only 75% of those who started chemoprophylaxis completed the course. The side effects of INH treatment were found in 23% of those on treatment, and one of the converters developed clinically active tuberculosis during the study period. At the King Faisal Specialist Hospital and Research Centre, the mean annual tuberculin skin test conversion rate among employees is similar to that found in other studies, but compliance to oral isoniazide prophylaxis is low. There is a need to develop strategies to improve compliance.
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