alexa Serodiagnosis of tuberculosis using two ELISA systems.
Microbiology

Microbiology

Mycobacterial Diseases

Author(s): Banerjee S, Gupta S, Shende N, Kumar S, Harinath BC

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Abstract Serodiagnosis by ELISA has been widely explored over the years, in the diagnosis of tuberculosis. Two ELISA systems were evaluated for detection of mycobacterial antibodies in pulmonary and extra pulmonary tuberculosis. The two test assays explored were ERBA LISA (TB IgG) test (Anda Biologicals) which uses A60 antigen complex found in the cytosol of typical and atypical mycobacteria, and SEVA TB (IgG) ELISA, which uses a 31 kDa, glycoprotein antigen purified fromM. tb H(37)Ra culture filtrate. Sera from 98 proven tuberculosis [pulmonary TB (48), tuberculous lymphadenopathy (30), tuberculous meningitis (15) & genitourinary TB (5)] were studied along with 32 healthy controls. The overall positivity obtained using ERBA LISA (TB IgG) test and SEVA TB (IgG) ELISA test was 72.9\% and 91.6\% in pulmonary tuberculosis, 43.3\% and 76.6\% in tuberculous lymphadenopathy respectively. The sensitivity of ERBA LISA test in tuberculous meningitis and genito-urinary TB was significantly low (26.6\% & 40\% respectively) compared to sensitivity obtained using SEVA TB ELISA (86.6\% & 60\% respectively) with overall specificity of 60\% and 87.5\%. Thus SEVA TB IgG ELISA test was found to be more sensitive than ERBA LISA in detecting IgG antibodies in tuberculous sera, in particular in extra pulmonary tuberculosis cases.
This article was published in Indian J Clin Biochem and referenced in Mycobacterial Diseases

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