Cost and performance analysis of haemagglutination inhibition, passive haemagglutination, radial haemolysis, and enzyme immunoassay for measuring rubella antibody

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Abstract

Cost and performance of non-commercial haemagglutination inhibition (HI) and radial haemolysis (RH) tests, and the commercially available passive haemagglutination (PHA) Rubacell and enzyme immunoassay (EIA) and Rubazyme assays were compared in their ability to detect rubella antibodies in 316 sera. Correlation coefficients were: HI to RH 0.96; HI to EIA 0.86. All 4 tests were in agreement on pre- and post-rubella immunization sera from 10 subjects. Eleven sera collected between 1 and 15 days after natural infection possessed clear HI titres whereas only 4 of them showed positive responses by PHA, RH or EIA. Immunity screening 285 sera identified 7 discordant results (positive in 2 of 4 tests). A detailed cost analysis for testing 100 sera showed a cost per test from $2.10 for HI to $3.71 for EIA. The labour component of the total cost was different for each assay and affected the unit cost of testing a single specimen. Results are discussed in view of antibody responses to specific rubella polypeptides and recommendations for diagnosis or immunity screening are made according to the findings.

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