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KMID : 0613620210410010283
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Health Social Welfare Review
2021 Volume.41 No. 1 p.283 ~ p.307
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Estimation of North Korea’s Tuberculosis Case Detection Rate and Disease Burden: Using Mathematical Modelling
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Park Se-Hee
Lee Tae-Jin
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Abstract
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To identify why tuberculosis still remains an unresolved issue in North Korea, this study focuses on the importance of case detection. The objectives of this research are to estimate tuberculosis case detection rate of North Korea by using mathematical modelling as well as empirical data and to examine the effect of case detection rate on the disease burden in the future. Dynamic transmission model was developed and the parameters, such as case detection rate and effective contact rate, were estimated based on model fitting to notified case data of North Korea. The model fitting was conducted as follows: first, the scenarios were developed according to the proportion of latent tuberculosis patients in 2000 and time dependent function of case detection rate, including constant, linear, and non-linear function; second, the candidate scenarios were selected depending on whether the predefined calibration target was satisfied; third, the best goodness-of-fit scenario was chosen as the final model. The result indicates that, in 2018, the case detection rate is estimated at 0.64 per year and the proportion of undetected patients in terms of new patients at 35%, and in terms of total patients at 70%. To reduce the basic reproduction number below the threshold of 1, the case detection rate should be a minimum of 1.38 per year. Assuming the case detection rate from year 2019 to 2070 is maintained at the 2018 level, the projected 2070 prevalence would be 470 per 100,000 population; 2070 prevalence is predicted to increase to 694, decrease to 322, and reduce to 71 per 100,000 population, provided that the case detection rate is 0.50, 0.80, 2.00 per year respectively. In conclusion, this study shows that the improvement of case detection is required to tackle tuberculosis in North Korea. In order to increase case detection rate, it is necessary to develop alternatives leading to improved speed on diagnosis as well as the expansion of diagnosis subjects.
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KEYWORD
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North Korea, Tuberculosis Case Detection, Dynamic Transmission Model, Calibration, Basic Reproduction Number
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