Improved serodiagnosis of tuberculosis using two assay test.

Area of Science:

• Immunology
• Infectious Diseases
• Medical Diagnostics

Background:

• Tuberculosis (TB) diagnosis relies on various methods, but serological tests require improvement.
• Accurate and sensitive diagnostic tools are crucial for effective TB management and control.

Purpose of the Study:

• To develop and evaluate an antigen capture immunoassay for detecting mycobacterial antigens in tuberculosis patients' sera.
• To assess the combined performance of an antigen assay and an antibody enzyme immunoassay for tuberculosis serodiagnosis.

Main Methods:

• Development of an antigen capture immunoassay for mycobacterial antigens.
• Clinical evaluation of the antigen assay alongside a commercial antibody enzyme immunoassay.
• Assessment of sensitivity and specificity for active pulmonary and extrapulmonary tuberculosis.

Main Results:

• The antibody assay showed 75% sensitivity for active pulmonary TB and 84.5% for extrapulmonary TB.
• The antigen assay demonstrated 45% sensitivity for active TB with no false positives.
• Combining both assays significantly increased total sensitivity to 96.5% with a negative predictive value of 0.98.

Conclusions:

• A combined antigen and antibody immunoassay approach offers improved serodiagnosis of tuberculosis.
• This dual assay strategy enhances diagnostic accuracy compared to single antibody tests.
• The combined test is relatively simple to perform, aiding in better tuberculosis diagnosis.