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Updated: Jan 11, 2026

A Step-By-Step Method to Detect Neutralizing Antibodies Against AAV using a Colorimetric Cell-Based Assay
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Optimization of a Quantitative Micro-neutralization Assay.

Yipu Lin1, Yan Gu2, John W McCauley1

  • 1Mill Hill Laboratory, The Francis Crick Institute.

Journal of Visualized Experiments : Jove
|January 7, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an advanced imaging-based micro-neutralization (MN) assay for precise influenza virus antigenic relationship quantification. This high-throughput, cost-effective method accurately measures virus infectivity and inhibition, even for difficult-to-culture strains.

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Area of Science:

  • Virology
  • Immunology
  • Biotechnology

Background:

  • The micro-neutralization (MN) assay is crucial for assessing influenza virus infectivity and replication inhibition.
  • Traditional plaque reduction assays have limitations in quantifying true antigenic relationships and handling certain virus strains.

Purpose of the Study:

  • To develop and validate an imaging-based MN assay for accurate quantification of antigenic relationships between influenza viruses.
  • To establish a high-throughput, cost-effective, and user-friendly method for influenza virus characterization.

Main Methods:

  • An imaging-based micro-neutralization assay protocol was developed, optimizing cell line selection for maximum infectivity and enhanced imaging.
  • Quantitative titration was introduced to standardize input virus amounts, ensuring experimental comparability.
  • A flatbed scanner and free software were utilized for a high-throughput imaging setup.

Main Results:

  • The improved MN assay accurately quantifies the entire infected cell population, overcoming limitations of plaque-based methods.
  • The assay demonstrated effectiveness with circulating influenza A(H1N1)pdm09, A(H3N2), and B viruses.
  • Results were not significantly affected by neuraminidase (NA) amino acid substitutions in A(H3N2) viruses.

Conclusions:

  • The imaging-based MN assay provides a robust method for determining true antigenic relationships among influenza viruses.
  • This assay is particularly valuable for characterizing viruses with low hemagglutinin (HA) titers or those causing abortive infections.
  • The protocol's accessibility and efficiency make it suitable for widespread laboratory adoption.