A rapid objective method for measuring the yeast opsonisation activity of serum

Area of Science:

• Immunology
• Clinical Chemistry

Background:

• Opsonisation is a key immune process involving phagocytic cells.
• Assessing opsonisation aids in identifying immunodeficiencies.
• Current methods, like microscopy, can be subjective and time-consuming.

Purpose of the Study:

• To develop a simple, objective, and semi-quantitative assay for yeast opsonisation.
• To validate the new assay against established methods.
• To assess the incidence of impaired opsonisation in a general school-aged population.

Main Methods:

• Development of a novel assay based on electronic counting of unphagocytosed yeast particles.
• Utilisation of a Coulter counter for precise particle quantification.
• Comparison of the new assay with the traditional microscope-based technique.

Main Results:

• The electronic counting assay demonstrated excellent correlation with the microscope technique.
• The assay is objective and semi-quantitative, offering improved reproducibility.
• Analysis of 112 schoolchildren revealed a distribution curve with two peaks.
• Seven individuals (approximately 6.25%) exhibited opsonisation values more than 2 standard deviations below the mean.

Conclusions:

• A reliable and objective semi-quantitative assay for yeast opsonisation has been successfully developed.
• The new assay provides a valuable tool for immunological studies and clinical diagnostics.
• The findings suggest a significant incidence of impaired opsonisation, indicative of immunodeficiency, within the studied school-aged population.