Serodiagnosis of tuberculosis using two ELISA systems

Area of Science:

• Immunology
• Infectious Diseases
• Medical Diagnostics

Background:

• Serodiagnosis using enzyme-linked immunosorbent assay (ELISA) is a valuable tool for tuberculosis diagnosis.
• Evaluating different ELISA systems is essential for optimizing diagnostic accuracy.

Purpose of the Study:

• To compare the diagnostic performance of two ELISA systems, ERBA LISA (TB IgG) and SEVA TB (IgG) ELISA, for detecting mycobacterial antibodies in tuberculosis patients.
• To assess the sensitivity and specificity of each ELISA in pulmonary and extrapulmonary tuberculosis cases.

Main Methods:

• Two ELISA kits were evaluated: ERBA LISA (TB IgG) using A60 antigen complex and SEVA TB (IgG) ELISA using a 31 kDa glycoprotein antigen.
• Sera from 98 proven tuberculosis patients (pulmonary, lymphadenopathy, meningitis, genitourinary) and 32 healthy controls were tested.

Main Results:

• SEVA TB (IgG) ELISA showed higher overall positivity rates (91.6% in pulmonary TB, 76.6% in lymphadenopathy) compared to ERBA LISA (72.9% and 43.3%, respectively).
• SEVA TB (IgG) ELISA exhibited significantly better sensitivity in tuberculous meningitis (86.6%) and genitourinary TB (60%) than ERBA LISA (26.6% and 40%, respectively).
• Overall specificities were 60% for ERBA LISA and 87.5% for SEVA TB (IgG) ELISA.

Conclusions:

• The SEVA TB IgG ELISA is more sensitive than the ERBA LISA test for detecting IgG antibodies in tuberculous sera.
• SEVA TB IgG ELISA demonstrates superior performance, especially in diagnosing extrapulmonary tuberculosis, offering a more effective serodiagnostic approach.