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Comparison of influenza serological techniques by international collaborative study
J M Wood1, R E Gaines-Das, J Taylor
1National Institute for Biological Standards and Control, Hertfordshire, UK.
Vaccine
|February 1, 1994
Summary
This study compared influenza serological techniques, finding single-radial haemolysis (SRH) more reproducible between labs than haemagglutination inhibition (HI). Standardizing assays is crucial for accurate influenza antibody measurement.
Area of Science:
- Virology
- Immunology
- Laboratory Medicine
Background:
- Influenza serological techniques are vital for monitoring immune responses.
- Inter-laboratory variability can impact the reliability of influenza antibody measurements.
Purpose of the Study:
- To investigate the reproducibility of haemagglutination inhibition (HI) and single-radial haemolysis (SRH) assays for influenza.
- To compare the performance of HI and SRH techniques across multiple international laboratories.
Main Methods:
- Seven laboratories in five countries participated in the collaborative study.
- Antibody levels to influenza A (H3N2, H1N1) and B viruses were measured in human and ferret sera using HI and SRH.
- A standard serum was utilized to facilitate direct comparison and improve inter-laboratory agreement.
Main Results:
- Both HI and SRH showed good reproducibility within laboratories.
- Inter-laboratory variability was significantly higher for HI (GCV 112%) compared to SRH (GCV 57%).
- SRH demonstrated greater sensitivity for detecting antibodies to influenza B viruses, while both methods showed equivalent sensitivity for influenza A.
Conclusions:
- SRH offers improved inter-laboratory reproducibility over HI for influenza antibody assays.
- Standardization using a reference serum enhances agreement between laboratories for both HI and SRH.
- The findings provide valuable insights for standardizing influenza antibody measurement techniques.