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Published on: July 22, 2012
Detection of Norwalk-like virus and specific antibody by immune-electron microscopy with colloidal gold immune
Y P Lin1, K Nicholas, F R Ball
1Laboratory Services Branch, Ontario Ministry of Health, Toronto, Canada.
Insights
This study developed novel immune electron microscopy methods for detecting Norwalk-like virus and antibodies. The solid-phase immune electron microscopy with colloidal gold immune complexes-triple layer method (SPIEMGIC-TLM) offers a sensitive and simple diagnostic tool.
Area of Science:
- Virology
- Immunology
- Microscopy
Background:
- Norwalk-like viruses are significant causes of gastroenteritis.
- Accurate detection of these viruses and specific antibodies is crucial for diagnosis and research.
- Existing detection methods may have limitations in sensitivity or ease of use.
Purpose of the Study:
- To evaluate different immune electron microscopy techniques for Norwalk-like virus detection.
- To develop and validate a sensitive and simple method for detecting Norwalk-like virus and specific antibodies in patient samples.
- To establish a highly sensitive method for screening monoclonal antibodies against Norwalk-like virus.
Main Methods:
- Direct electron microscopy (DEM) and immune electron microscopy (IEM) were compared.
- Four procedures using colloidal gold immune complexes were assessed.
- A novel solid-phase immune electron microscopy with colloidal gold immune complexes-triple layer method (SPIEMGIC-TLM) was developed.
- A quadruple layer method (SPIEMGIC-QLM) was established by adding a cross-linking anti-IgG layer.
Main Results:
- The SPIEMGIC-TLM demonstrated low non-specific background labeling.
- SPIEMGIC-TLM proved to be simple, sensitive, and easy to perform for detecting Norwalk-like virus and specific antibodies.
- SPIEMGIC-QLM offered enhanced sensitivity, suitable for screening monoclonal antibodies.
Conclusions:
- The developed SPIEMGIC-TLM is an effective method for screening patient specimens for Norwalk-like virus and antibodies.
- The SPIEMGIC-QLM provides a highly sensitive platform for monoclonal antibody screening against Norwalk-like virus.
- These advancements improve the diagnostic capabilities for Norwalk-like virus infections.
Abstract:
Direct electron-microscopy (DEM), immune electron microscopy (IEM) and four different procedures of immune electron microscopy with colloidal gold immune complexes were evaluated for the detection of Norwalk-like virus and specific antibody. A solid-phase immune electron microscopy with colloidal gold immune complexes-triple layer method (SPIEMGIC-TLM) is developed for screening patients' specimens for the detection of Norwalk-like virus and its specific antibody. The method demonstrates low non-specific background labelling and is simple, sensitive and easy to perform. A quadruple layer method (SPIEMGIC-QLM), which is a modification of the triple layer method, has been established by adding a cross-linking anti-IgG layer to amplify the reaction and to provide a more sensitive test which is suitable for screening monoclonal antibodies prepared against 32-34-nm Norwalk-like virus isolated in our laboratory.
