Abstract
An antibody capture enzyme-linked immunosorbent assay (ELISA) that uses horseradish-peroxidase-labeled antigen for the detection of immunoglobulin G (IgG) antibodies to cytomegalovirus (CMV) is described. A microtiter plate was coated with anti-human IgG and consecutively incubated with serum specimens, enzyme-labeled CMV antigen made from CMV-infected cell nuclei, and substrate. The CMV IgG antibody content was determined spectrophotometrically and expressed as absorbance. Furthermore, to reveal any nonspecific reactions, all sera were tested against an enzyme-labeled control antigen made from uninfected cell nuclei. The problem with nonspecific reactions was small and was circumvented by the addition of unlabeled control antigen to the conjugates. For epidemiological studies the test was not as sensitive as other serological tests. On the other hand, the IgG antibody capture ELISA was highly sensitive for detecting the serological antibody response in patients with primary and recurrent CMV infections. Thus, one positive serum remained positive at a serum dilution of 1:10(7). The specificity of the test was shown by a blocking experiment and by testing 126 complement fixation-positive sera, of which 97% were positive. There was a rather good correlation between the complement fixation test and the IgG antibody capture ELISA (rs = 0.79, P less than 0.001). The test is especially useful when tests for CMV antibodies of the IgM, IgA, and IgE classes are run by similar antibody capture ELISAs, since the same procedure and conjugate are used.
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Selected References
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