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Sensitive neutralization test for rubella antibody.

H Sato, P Albrecht, S Krugman

Journal of Clinical Microbiology

|February 1, 1979

Summary

A new rubella antibody test offers enhanced sensitivity, detecting higher antibody titers than traditional methods. This modified plaque neutralization test is valuable for specific diagnostic needs, especially in cerebrospinal fluid analysis.

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Area of Science:

Virology
Immunology
Diagnostic Microbiology

Background:

Rubella virus antibody detection is crucial for diagnosing infections and assessing immunity.
Conventional methods like hemagglutination inhibition (HAI) and standard plaque neutralization tests have limitations in sensitivity.
Measuring rubella-specific antibodies in cerebrospinal fluid (CSF) presents unique challenges.

Purpose of the Study:

To develop and characterize a modified rubella virus plaque neutralization test with enhanced sensitivity.
To evaluate the performance of this enhanced test compared to existing methods.
To determine the utility of the enhanced test for specific clinical applications, including CSF analysis.

Main Methods:

Development of a modified plaque neutralization test utilizing heterologous anti-immunoglobulin to potentiate virus-antibody complexes.
Comparison of antibody titers obtained with the enhanced test against HAI and conventional plaque neutralization tests.
Assessment of test specificity through seroconversion data from vaccinated individuals.
Evaluation of prozone phenomenon and its impact on serum and CSF testing.

Main Results:

The modified test demonstrated significantly higher sensitivity, yielding titers 50-100 times greater than HAI or conventional plaque neutralization.
A prozone phenomenon was observed in serum testing, limiting detection of low-titered samples below 1:16 dilution.
No prozone effect was noted when testing cerebrospinal fluids.
Test specificity was confirmed by seroconversion in vaccinated individuals.

Conclusions:

The enhanced rubella neutralization test provides superior sensitivity for rubella antibody detection.
While HAI remains suitable for routine diagnostics, the enhanced test is particularly valuable for monitoring low-level antibodies in CSF.
This method aids in diagnosing neurological disorders associated with rubella and evaluating vaccine failures.

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