Abstract
A simple dot immunobinding (dot blot) assay procedure has been developed for the detection of antibodies directed against a soluble mycobacterial antigen preparation. This technique was compared with the widely used ELISA, in a study of samples from tuberculous patients. Dot blots were read on a densitometer. The correlation between both assays was excellent ( r = 0.91; P < 0.001); 90% of sera from tuberculous patients were detected using both techniques and a serial two-fold dilution method. Assessments of the end-points of titration curves by reflectometry and simple visual interpretation gave similar results. The dot blot assay is easier to perform and appears to be a practical alternative to ELISA for the detection of anti-myobacterial antibodies in tuberculous patients.
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