Visualizing Ebolavirus Particles Using Single-Particle Interferometric Reflectance Imaging Sensor (SP-IRIS).

Area of Science:

• Virology
• Biophysics
• Microscopy

Background:

• Accurate detection and quantification of Ebola virus (EBOV) are crucial for understanding its pathogenesis and developing diagnostics.
• Traditional methods for virus imaging often require labeling or electron microscopy, which can be complex and time-consuming.

Purpose of the Study:

• To develop and describe a label-free light microscopy approach for the imaging and quantification of intact EBOV and EBOV viruslike particles (VLPs).
• To enable the structural resolution of EBOV VLPs without the need for electron microscopy.

Main Methods:

• Utilizes interference reflectance imaging on a silicon chip functionalized with virus-specific antibodies to capture individual virus particles.
• Enables label-free detection and imaging of captured virions directly from various sample types, including blood and tissue culture medium.

Main Results:

• Demonstrates the ability to resolve the filamentous structure of EBOV VLPs using light microscopy.
• Achieves automated quantitative analysis of captured virions, allowing for determination of virus concentration in unknown samples.
• Provides a means to assess particle size and morphology in a quantitative manner without additional labeling.

Conclusions:

• The developed interference reflectance imaging technique offers a sensitive and quantitative method for label-free analysis of EBOV and EBOV VLPs.
• This approach simplifies virus imaging and quantification, making it accessible for various research and diagnostic applications.
• The technique facilitates the study of virion morphology and concentration in native biological samples.