An assay for quantifying infectious HIV particles

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Accurate quantification of infectious viral particles is crucial for understanding viral pathogenesis and evaluating antiviral therapies.
• Existing methods for Human Immunodeficiency Virus (HIV) quantification may have limitations in assessing infectious viral load.

Purpose of the Study:

• To develop and validate a novel method for quantifying infectious Human Immunodeficiency Virus (HIV) particles in biological preparations.
• To establish a reliable assay for determining viral infectivity applicable to cell-associated viruses.

Main Methods:

• Developed a method involving mixing virus with susceptible cells to facilitate viral binding.
• Immobilized virus-infected cells within an agar gel matrix to prevent further virus transfer.
• Incubated cells for 4 days to allow expression of viral antigens.
• Quantified infected cells using indirect immunofluorescence assay to determine the percentage of cells expressing viral antigens.

Main Results:

• Successfully developed a method to assess the number of infectious viral particles.
• Demonstrated that the method allows for the detection and quantification of HIV-infected cells through viral antigen expression.
• The percentage of infected cells directly correlates with the initial infectious viral load.

Conclusions:

• The developed agar-based immunofluorescence assay provides a robust method for quantifying infectious HIV particles.
• This technique is presumed to be adaptable for assessing infectivity of other viruses that replicate in non-adherent cells.
• This assay offers a valuable tool for virology research and diagnostics.