Serological evaluation for tuberculosis by antigen 60 IgG ELISA test

Area of Science:

• Immunology
• Infectious Diseases
• Diagnostic Medicine

Background:

• Tuberculosis (TB) is a major global health concern, with high rates of illness and death, especially in developing nations and Taiwan.
• Traditional diagnostic methods like acid-fast smear and culture are often ineffective for extrapulmonary or smear-negative TB.
• Improved diagnostic tools are crucial for effective TB management.

Purpose of the Study:

• To evaluate the efficacy of an enzyme-linked immunosorbent assay (ELISA) using Antigen 60 for detecting tuberculosis.
• To assess the test's performance in differentiating between tuberculous and non-tuberculous conditions.
• To determine the utility of this ELISA in diagnosing various forms of tuberculosis, including extrapulmonary TB.

Main Methods:

• An enzyme-linked immunosorbent assay (ELISA) was developed to detect serum IgG antibodies against Antigen 60.
• The test was applied to 146 subjects: 78 with tuberculosis and 68 without.
• A positive result was defined as a titer of 200 serounits or higher.

Main Results:

• The ELISA showed a positive rate of 83.8% in active tuberculosis cases (57/68).
• Effectiveness was noted in diagnosing extrapulmonary tuberculosis (66.7% positive) and mixed cases (83.3% positive).
• The false positive rate in the non-tuberculous group was 29.4% (20/68), with higher rates in healthy individuals and those with non-TB pulmonary diseases.

Conclusions:

• The ELISA test utilizing Antigen 60 is a valuable tool for enhancing tuberculosis diagnosis.
• This method shows particular promise for improving the detection of extrapulmonary tuberculosis.
• Further research may refine its application in clinical settings.