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Updated: Apr 23, 2026
High-throughput Detection Method for Influenza Virus
Published on: February 4, 2012
Multi-colored immunochromatography using nanobeads for rapid and sensitive typing of seasonal influenza viruses
Akira Sakurai1, Katsuyoshi Takayama2, Namiko Nomura1
1Department of Molecular Medical Research, Tokyo Metropolitan Institute of Medical Science, 2-1-6, Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan.
Insights
A new NanoAct™ bead immunochromatography (IC) assay offers 10-fold higher sensitivity for detecting influenza viruses. This rapid, instrument-free method improves early diagnosis and differentiation of influenza A and B strains.
Area of Science:
- Medical diagnostics
- Virology
- Nanotechnology
Background:
- Immunochromatography (IC) is crucial for rapid influenza virus diagnosis.
- Current IC kits have limited sensitivity (10^3-10^4 pfu/reaction), hindering early detection.
- Early diagnosis (within 24h) is vital for timely influenza treatment.
Purpose of the Study:
- To develop a highly sensitive immunochromatography assay for seasonal influenza virus detection.
- To improve upon the sensitivity limitations of existing colloidal gold and latex bead IC assays.
- To establish a method for differentiating influenza A and B viruses.
Main Methods:
- Development of a multi-colored NanoAct™ bead immunochromatography (IC) assay.
- Utilized NanoAct™ beads for enhanced antigen detection.
- Assayed clinical samples for influenza virus detection and differentiation.
Main Results:
- The NanoAct™ bead IC assay demonstrated approximately 10-fold higher sensitivity compared to conventional IC methods.
- The assay successfully distinguished between influenza A and B viruses.
- The method provides a straightforward readout using colored lines and requires no specialized instruments.
Conclusions:
- NanoAct™ bead IC offers a sensitive, rapid, and instrument-free approach for influenza virus detection.
- This technology can aid in early diagnosis and treatment of influenza.
- The assay has potential applications in developing countries and field research for influenza surveillance.
Abstract:
Immunochromatography (IC) is an antigen-detection assay that plays an important role in the rapid diagnosis of influenza viruses because of its rapid turnaround and ease of use. Despite the usefulness of IC, the limit of detection of common IC kits is as high as 10(3)-10(4) plaque forming units (pfu) per reaction, resulting in their limited sensitivities. Early diagnosis within 24h would provide more appropriate timing of treatment. In this study, a multi-colored NanoAct™ bead IC was established to detect seasonal influenza viruses. This method has approximately 10-fold higher sensitivity than that of colloidal gold or colored latex bead IC assays, and does not require specific instruments. More notably, NanoAct™ bead IC can distinguish influenza A and B viruses from clinical samples with a straightforward readout composed of colored lines. Our results will provide new strategies for the diagnosis, treatment, and a chance to survey of influenza viruses in developing countries and in the field research.
