Detection of viruses by electron microscopy: an efficient approach

Area of Science:

• Virology
• Microscopy Techniques
• Biochemistry

Background:

• Electron microscopy grid preparation is crucial for virus detection.
• Standard carbon or plastic/carbon grids are hydrophobic and negatively charged.
• Negatively charged viruses at neutral pH exhibit poor adhesion to grids, leading to loss or clumping.

Purpose of the Study:

• To evaluate the efficacy of poly-L-lysine hydrobromide as a wetting agent for virus detection in electron microscopy.
• To assess the impact of poly-L-lysine hydrobromide treatment on virus concentration and detection rates in fecal samples.

Main Methods:

• Electron microscopy grid preparation using poly-L-lysine hydrobromide (0.1%).
• Processing of fecal samples from patients with gastroenteritis.
• Comparative analysis of grids treated and untreated with poly-L-lysine hydrobromide.

Main Results:

• Poly-L-lysine hydrobromide treatment significantly increased virus concentration on electron microscopy grids.
• A notable increase in the general detection rate of positive samples was observed.
• Improved virus adherence to the support film was achieved.

Conclusions:

• Poly-L-lysine hydrobromide is an effective wetting agent for enhancing virus detection via electron microscopy.
• This method improves the sensitivity of viral diagnostics in clinical samples like feces.
• The use of poly-L-lysine hydrobromide offers a practical solution for overcoming grid wetting challenges in electron microscopy.