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Related Experiment Video

Updated: Dec 26, 2025

An Optimized Hemagglutination Inhibition HI Assay to Quantify Influenza-specific Antibody Titers
06:34

An Optimized Hemagglutination Inhibition HI Assay to Quantify Influenza-specific Antibody Titers

Published on: December 1, 2017

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Hemagglutination Inhibition Assay.

Erica Spackman1, Ioannis Sitaras2

  • 1Exotic and Emerging Avian Viral Diseases Unit, US National Poultry Research Center, US Department of Agriculture, Agricultural Research Service, Athens, GA, USA. Erica.spackman@usda.gov.

Methods in Molecular Biology (Clifton, N.J.)
|March 15, 2020
PubMed
Summary

The hemagglutination inhibition (HI) assay detects influenza A virus antibodies and characterizes viral differences. While historically vital for subtype identification, gene sequencing is now replacing HI assays for this role.

Keywords:
Antigenic characterizationHemagglutinationHemagglutination inhibitionInfluenza subtype identificationType A influenza

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Area of Science:

  • Virology
  • Immunology
  • Epidemiology

Background:

  • The hemagglutination inhibition (HI) assay has been a cornerstone in influenza A virus research since the 1940s.
  • It plays a crucial role in detecting and quantifying antibodies, characterizing antigenic differences, and supporting surveillance and vaccine development.

Purpose of the Study:

  • To review the historical and current applications of the hemagglutination inhibition (HI) assay in influenza A virus research.
  • To highlight its utility in antibody detection, antigenic characterization, and epidemiological studies.
  • To discuss the evolving role of the HI assay in light of advancements in gene sequencing technology.

Main Methods:

  • The study is a review of the established applications and methodologies of the hemagglutination inhibition (HI) assay.
  • It synthesizes information regarding the assay's use in antibody quantification, antigenic cartography, and influenza surveillance.
  • Comparative analysis with emerging technologies like gene sequencing is discussed.

Main Results:

  • The HI assay remains a fast, inexpensive, and accessible method for antibody quantification and characterization of influenza A virus isolates.
  • Historically, it has been pivotal for subtype identification, a role increasingly being assumed by gene sequencing.
  • Data generated from HI assays are integral to antigenic cartography, surveillance, epidemiology, and vaccine strain selection.

Conclusions:

  • The hemagglutination inhibition (HI) assay continues to be a valuable tool in influenza A virus research, particularly for antibody quantification and antigenic characterization.
  • Its historical significance in subtype identification is diminishing as gene sequencing offers a faster and more cost-effective alternative.
  • The assay's established role in surveillance and vaccine development ensures its continued relevance in the field of influenza virology.