The risk of active tuberculosis among individuals living in tuberculosis-affected households in the Republic of Korea, 2015

Autoři: Jiyeon Yang aff001;  Sodam Lee aff001;  Suhyeon Oh aff001;  Sunmi Han aff001;  Shin Young Park aff001;  Youngman Kim aff001;  Jieun Kim aff001;  Mi-sun Park aff001
Působiště autorů: Korea Centers for Disease Control & Prevention, Cheongju, Republic of Korea aff001
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article



In the Republic of Korea (ROK), compared to other high-income countries, tuberculosis (TB) prevalence is relatively high. Active TB and latent TB infection (LTBI) surveillance of individuals living in TB-affected households has been conducted for several years. Although active case finding is an important strategy in low-prevalence, high-income countries, its effectiveness in a high prevalence setting is unclear. This study evaluated the risk of TB in household contact by calculating the incidence of TB among household contacts and comparing it with the general population of the ROK.


A retrospective cohort study, including 36,133 household-contacts of 17,958 TB patients reported in 2015, was conducted. The data was extracted from the Korean National TB Surveillance System (web-based TB cases notification system, KNTSS). The Cox proportional hazard regression model was used to evaluate risk factors for incidence of TB. A P-value < .05 was considered statistically significant.


In this study, 319 (0.9%) of 36,133 household-contacts were reported as having TB within 1 year, which is a higher rate than the rate for the general population in the ROK. The rate of TB reported for contacts that had completed LTBI treatment (0.6%) was lower than for the LTBI group without treatment (4.6%). In multivariate analysis, age older than 65 (p < .001), being a spouse of a TB patient (p = .007), and LTBI without treatment (p = .013) were each a risk factor for TB incidence among contacts. Younger age (p < .001), presence of a cough (p < .001), testing positive for acid-fast bacilli (AFB; p < .001), and cavity on radiograph (p < .001) of the index patient were also statistically significant risk factors.


Individuals living in TB-affected households are at high risk of developing TB in the ROK and active case finding among them is a strategy effective in the early detection and prevention of TB.

Klíčová slova:

Coughing – Korean people – Medical risk factors – South Korea – Sputum – Tuberculosis – Tuberculosis diagnosis and management


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2019 Číslo 12
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