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Rapid method for determining serum bactericidal activity.

R B Provonchee, S H Zinner

Applied Microbiology

|January 1, 1974

Summary

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This study introduces a novel replicator method for efficiently screening large serum volumes to assess bactericidal activity. The technique offers a high-throughput alternative to traditional methods, requiring minimal serum. Keywords: bactericidal activity, serum screening, replicator method.

Area of Science:

Microbiology
Immunology
Biotechnology

Background:

Assessing bactericidal activity of sera is crucial for understanding immune responses.
Traditional methods for serum bactericidal assays are often labor-intensive and require significant sample volumes.

Purpose of the Study:

To develop and validate a high-throughput method for screening large numbers of sera for bactericidal activity.
To adapt the Steers-Foltz replicator, typically used for antibiotic susceptibility testing, for serum bactericidal assays.

Main Methods:

Utilized the Steers-Foltz replicator to combine serum, bacterial suspension, and buffer in micro-wells.
Incubated mixtures and sampled at various time points (0, 1, 2, 3 hours) by stamping onto nutrient agar plates.
Assessed bactericidal activity through visual inspection of bacterial growth inhibition on incubated plates.

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Main Results:

The replicator method demonstrated comparable results to standard pipetting-pour plate methods across 28 serum-organism pairs.
The assay allows for the simultaneous testing of numerous serum samples.
The method requires only negligible amounts of serum per sample.

Conclusions:

The Steers-Foltz replicator method provides a rapid, efficient, and serum-sparing approach for determining bactericidal activity.
This technique is suitable for large-scale screening of sera in research and diagnostic settings.
The method facilitates high-throughput analysis of serum immune function.