108 A study on the workers with latent tuberculosis infection in a tertiary hospital

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The risk of contracting with Latent Tuberculosis Infection (LTBI) is higher among those who are dealing with patients directly. Control of LTBI is an important step towards tuberculosis elimination.


LTBI was assessed by Tuberculin Skin Test by screening new workers and through contact tracing. A cross-sectional study of 362 workers infected with LTBI were detected from 2013–2016. The study was done to obtain the information on the gender, age, job category and workplace, results of chest X-ray, history of previous Bacillus Calmette-Guerin (BCG) vaccination and infection with tuberculosis. These data were collected from the Occupational Health Clinic of the hospital and a descriptive study was done.


106 males (29.3%) and 256 females (70.7%) were evaluated. 60.2% of them were 30 years old and below. Majority were nurses (31.8%) and 64.4% of the LTBI cases were detected from contact tracing. 261 workers (72.1%) were from clinical departments. Majority of the workers (76.5%) were known to be vaccinated with BCG. Only 1.6% of them had previous history of tuberculosis. As low as 12.2% of the workers had some chest x-ray changes on investigation and 17.7% were referred to pulmonologist due to various reasons. Out of 362 LTBI workers, six were found to have positive TB.


Although very few workers with LTBI became positive tuberculosis, the practices of tuberculosis infection control have to be strengthened in high risk places such as hospitals.

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