Martin U, Hasibuan P. J Respir Indones. 2010;30(2);112-8.
Objective : Health care workers (HCWs) in developing countries are at risk for nosocomial tuberculosis (TB). In this study, we are going to determine the prevalence of latency tuberculosis among HCWs in H. Adam Malik hospital in Medan.
Material and Methods : It is a cross sectional study, conducted between July and August 2008. Tuberculin skin test (TST) survey was conducted among 100 HCWs and measured the induration size. Afterward, individuals with positive TST result were examined chest x-ray to determine latency TB.
Result : From 100 participants, 53 (53%) had indurations more than 10 mm and 47 (47%) had indurations less than 10 mm. All of the HCWs with positive TST results had normal chest x-ray. Risk factors associated with a positive TST result were age = 35 years (prevalence ratio, 1,6 [ 95% CI 0,71 to 3,60]), length of professional activity > 5 years (prevalence ratio, 3 [ 95% CI 0,76 to 1,82]), historical BCG vaccination (prevalence ratio, 1,1 [ 95% CI 0,15 to 8,38]), and contact with tuberculosis case (prevalence ratio, 1,1 [ 95% CI 0,51 to 2,51]). None of the risk factors that were assessed had statistically significant (p > 0,05).
Conclusions : The prevalence of latency tuberculosis among HCWs in H. Adam Malik hospital in Medan is 53% that is similar to the prevalence latency tuberculosis in developing countries.
Keywords : Tuberculin Skin Test, Latency Tuberculosis, Health Care Workers, latent tuberculosis, tb laten, tuberkulosis laten, tst, mantoux, tes mantoux