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Chinese Journal of Antituberculosis ›› 2024, Vol. 46 ›› Issue (8): 897-902.doi: 10.19982/j.issn.1000-6621.20240137

• Original Articles • Previous Articles     Next Articles

Analysis of screening effect of recombinant Mycobacterium tuberculosis fusion protein in screening Mycobacterium tuberculosis infection in close contacts of pulmonary tuberculosis patients

Xu Chunhua1, Zhu Shiyu2, Hu Yi3, Yi Kehua4, Song Canlei5, Wang Zichun1, Wu Yong6, Wang Qing1, Yang Qianru7, Shen Xin8()   

  1. 1Department of Sexually Transmitted Diseases and Tuberculosis Prevention and Control, Fengxian District Center for Disease Control and Prevention, Shanghai 201499,China
    2Department of Sexually Transmitted Diseases and Tuberculosis Prevention and Control,Jinshan District Center for Disease Control and Prevention, Shanghai 201599,China
    3Department of Epidemiology, School of Public Health, Fudan University, Shanghai 200032,China
    4Fengxian District Center for Disease Control and Prevention, Shanghai 201499, China
    5Jinshan District Center for Disease Control and Prevention, Shanghai 201599, China
    6Department of Preventive Healthcare, Haiwan Community Health Service Center in Fengxian District, Shanghai 201419,China
    7School of Life Sciences, Fudan University, Shanghai 200032,China
    8Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336,China
  • Received:2024-04-11 Online:2024-08-10 Published:2024-08-01
  • Contact: Shen Xin E-mail:shenxin@scdc.sh.cn
  • Supported by:
    Three-Year Initiative Plan (2023—2025) for Strengthening Public Health System Construction in Shanghai(GWVI-9);Key Disciplines of Three-Year Initiative Plan (2023—2025) for Strengthening Public Health System Construction in Shanghai(GWVI-11.1-05);Shanghai Oriental Talents Plan Top-notch Project(2023-2025);The Youth Backbone Talent Training Project of Shanghai Center for Disease Control and Prevention(22QNGG18)

Abstract:

Objective: To evaluate the accuracy and feasibility of recombinant Mycobacterium tuberculosis fusion protein (EC) skin test in tuberculosis screening among close contacts of pulmonary tuberculosis patients and to provide technical recommendations for improving tuberculosis control,and to understand the status of latent infection of Mycobacterium tuberculosis (LTBI) in close contacts. Methods: A total of 140 close contacts of tuberculosis patients from Fengxian and Jinshan Districts in Shanghai City were selected as the study subjects. Both IGRA and EC skin tests were administered. Kappa test was used to assess the consistency between the results of those two methods, and chi-square test was employed to compare the differences between these two detection methods. A P-value of <0.05 was considered statistically significant. Results: A total of 140 subjects were included in the study, consisting of 55 males and 85 females. The positive rate of IGRA was 15.00% (21/140), while the positive rate of EC skin test was 14.29% (20/140). There was no statistically significant difference between them (χ2=0.029, P=0.866), with a Kappa value of 0.857 (P=0.001), indicating a high degree of consistency. When IGRA was used as the reference standard for tuberculosis infection, EC skin test demonstrated a sensitivity of 85.71% (18/21), a specificity of 98.32% (117/119), a positive predictive value of 90.00% (18/20), and a negative predictive value of 97.50% (117/120). The positive rate of EC in males (32.73%, 18/55) was significantly higher than that in females (2.35%, 2/85), and the difference was statistically significant (χ2=17.983,P<0.001). Conclusion: EC skin test demonstrates high specificity and can be utilized for Mycobacterium tuberculosis infection screening among close contacts of tuberculosis patients. However, due to limitations regarding age range and contraindications for use, implementing a combined screening method of EC and IGRA is advisable.

Key words: Mycobacterium tuberculosis, Contact tracing, Mycobacterium infections, Recombinant Mycobacterium tuberculosis fusion protein

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