An ELISA-inhibition assay for antibody to human immunodeficiency virus core antigen (p24)

Area of Science:

• Immunology
• Virology
• Diagnostic Assays

Background:

• Accurate detection of Human Immunodeficiency Virus type 1 (HIV-1) infection is crucial for patient management and public health.
• The p24 antigen and p24 antibodies are key markers in HIV-1 infection, but their detection can be complex.
• Existing diagnostic methods may require further refinement for comprehensive HIV-1 screening.

Purpose of the Study:

• To develop and validate a simple ELISA-inhibition assay for detecting p24 antibodies.
• To assess the utility of this assay in differentiating HIV-1 infection statuses.
• To evaluate the assay's performance on sera from individuals with indeterminate HIV-1 reactions.

Main Methods:

• Development of an ELISA-inhibition assay utilizing commercially available HIV-1 p24 antigen test kits.
• Testing of serum samples from HIV-1 positive (Western blot positive), HIV-1 negative, and indeterminate cases.
• Comparison of ELISA-inhibition results with Western blot and p24 antigen test results.

Main Results:

• The developed ELISA-inhibition assay demonstrated specificity and simplicity in detecting p24 antibodies.
• p24 antibodies were consistently detected in p24 antigen-negative, Western blot-positive sera.
• p24 antibodies were infrequently detected in p24 antigen-positive sera.
• Sera from patients with indeterminate HIV-1 reactions tested negative for both p24 antigen and p24 antibodies in the ELISA-inhibition assay.

Conclusions:

• The ELISA-inhibition assay is a valuable tool for detecting p24 antibodies, particularly in conjunction with p24 antigen testing.
• This assay can aid in the interpretation of HIV-1 test results, especially in cases with indeterminate Western blots.
• The assay's performance suggests its potential role in improving the accuracy and clarity of HIV-1 diagnostics.