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Rapid assay for antibodies to Varicella-Zoster virus (VZV) using a VZV-HEM preparation
Insights
A new freeze-dried varicella-zoster virus (VZV) antigen assay, VZV-HEM, provides rapid and simple serological testing. This method accurately detects VZV immunity, proving useful for emergency assessments in at-risk individuals.
Area of Science:
- Immunology
- Virology
- Diagnostic Assays
Background:
- Chickenpox, caused by the varicella-zoster virus (VZV), requires reliable methods to assess immunity.
- Existing serological tests for VZV antibodies can be time-consuming or complex.
- The need for rapid and accessible diagnostic tools for VZV immunity is critical, especially in clinical settings.
Purpose of the Study:
- To develop and evaluate a novel freeze-dried, formalized-erythrocytes-bound VZV antigen (VZV-HEM) for indirect hemagglutination (IHA).
- To compare the diagnostic performance of the VZV-HEM assay with traditional IHA and ELISA methods.
- To assess the suitability of VZV-HEM for rapid serological testing of VZV immunity.
Main Methods:
- Preparation of a freeze-dried, formalized-erythrocytes-bound VZV antigen (VZV-HEM).
- Serological testing of 46 children with a history of chickenpox using VZV-HEM.
- Comparative analysis with indirect hemagglutination using fresh VZV antigen and enzyme-linked immunosorbent assay (ELISA).
Main Results:
- The VZV-HEM assay demonstrated congruent results with fresh VZV antigen IHA and ELISA in 97.8% of cases.
- VZV-HEM provided results within 2 hours of serum dilution, highlighting its speed.
- The assay proved to be simple to perform, requiring minimal technical expertise.
Conclusions:
- The VZV-HEM assay is a reliable and efficient method for detecting VZV antibodies.
- Its rapid turnaround time and simplicity make it ideal for emergency immunity testing.
- VZV-HEM is a valuable tool for assessing VZV immunity in clinical practice, particularly for individuals at risk.
Abstract:
A freeze-dried, formalized-erythrocytes-bound VZV antigen for indirect haemagglutination, VZV-HEM, was prepared. It was used to test serologically 46 children, all of them patients of Prague paediatric clinics, with a known history of chickenpox. For comparison, the same sera were tested by the indirect haemagglutination reaction with freshly prepared VZV antigen and by ELISA. All three serological tests gave congruent results in 97.8% of cases. The advantages of the VZV-HEM assay are results obtainable within 2 hours of serum dilution and simplicity. The assay is especially suitable for emergency testing the immunity of persons at risk.