Viral Antigen Detection
Viral Antigen Detection - Related Videos
05:04
Viral Antigen Microarray Assay to Detect Antibody Isotypes in Serum Against Viral Antigen
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2025
In this video, we demonstrate the process for detecting antibody isotypes in multiple human serum samples using a microarray slide printed with antigenic subtypes of influenza virus strains.
02:50
Suppressing Hepatitis B Virus Replication Using Viral Antigen-Specific T Cells
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2025
The video demonstrates an assay using human induced pluripotent stem cell (iPSC)-derived CD8+ T cells to inhibit hepatitis B virus (HBV) replication in mice. These T cells, engineered with HBV-specific receptors, are transferred into transgenic mice. Replication-competent HBV genome plasmids are then injected directly into the liver, enabling viral DNA uptake. Once viral antigens are expressed and presented by hybrid MHC-I molecules, the engineered T cells recognize and bind to these complexes.
04:34
An Immunohistochemistry Staining for the Detection of Rabies Virus Antigens
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2025
This video demonstrates immunohistochemistry staining for rabies virus antigen detection in infected mouse brain tissue. The process includes deparaffinization and alcohol treatment, followed by proteolytic treatment to enhance antigen accessibility. Immunohistochemistry staining reveals red precipitates, confirming the presence of rabies antigens in the tissue section.
03:13
Immunostaining to Visualize Viral Antigen and Host Protein Colocalization in the Insect Gut
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2026
Source: Zhang, L., et al. Immunofluorescent Labeling of Plant Virus and Insect Vector Proteins in Hemipteran Guts. J. Vis. Exp. (2021)The video demonstrates the preparation of gut tissue from a plant virus–infected insect vector for fluorescence imaging. Fixed guts were washed, permeabilized, and incubated with two fluorescent antibodies in a blocking solution—one targeting a viral antigen in vesicles, the other a vesicle-associated membrane protein. The tissue was counterstained for actin...
03:59
The Hemagglutination Inhibition Assay to Detect Serum Antibodies Against a Target Antigen
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2025
The video demonstrates a hemagglutination inhibition assay for detecting serum antibodies against specific antigens. Confirmation of hemagglutination inhibition in the test well and hemagglutination in the control well is achieved through distinct visual patterns. This assay plays a crucial role in assessing immune response, vaccine effectiveness, and studying viral infections in virology and immunology.
FAQs
The assay relies on selective recognition: antibodies bind a viral protein in the tested material, forming an immune complex. That binding event is then coupled to a readout that may be visible, colorimetric, fluorescent, or instrument-based. Thus, the biological recognition step and the signal-generation step together produce an interpretable result.
Because it detects a viral component directly, the method provides evidence that differs from serology, which depends on host antibody production. It also complements nucleic acid testing rather than replacing it. Using these approaches together can give biology and infectious-disease studies distinct types of information about viral presence and the host response.
Lateral-flow tests and enzyme-linked immunosorbent assays use the same central antibody-based recognition principle but present results differently. A lateral-flow format can provide a visible result, whereas an enzyme-linked immunosorbent assay may produce a colorimetric signal that is read visually or with an instrument. The format therefore influences how the result is observed.
Direct detection can provide evidence of viral presence without waiting for host antibody production, which is why it is relevant when timely results matter. This supports rapid screening and outbreak response, while also making the method useful for monitoring viral circulation in biology and infectious-disease settings.
A basic workflow starts with a clinical or biological sample and exposes its contents to antibodies directed against a viral antigen. If the target is present, immune complexes form and are linked to the assay’s signal system. The final step is reading the visible, colorimetric, fluorescent, or instrument-based output to support interpretation.
In biology and infectious-disease research, the approach is useful when investigators need timely evidence of viral circulation. Its role in rapid screening can support outbreak response, while its use in monitoring can help track viral presence within a research or outbreak-response context. It therefore complements broader diagnostic strategies.