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Updated: Jun 13, 2026

Multiplex Detection of Bacteria in Complex Clinical and Environmental Samples using Oligonucleotide-coupled Fluorescent Microspheres

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The Most Probable Limit of Detection (MPL) for rapid microbiological methods.

G P H T Verdonk¹, M J Willemse, S G G Hoefs

¹Microbiology Control Lab B, Merck Sharp; Dohme Oss, Molenstraat 110, PO Box 20, 5340 BH Oss, The Netherlands. geert.verdonk@merck.com

Journal of Microbiological Methods

|May 18, 2010

Summary

Classical microbiology methods are slow. A new "most probable limit" method precisely estimates the limit of detection for rapid microbiological tests, demonstrating a detection limit of one microorganism with two rapid methods.

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Area of Science:

Microbiology
Pharmaceutical Science
Analytical Chemistry

Background:

Classical microbiological methods suffer from long cycle times, hindering pharmaceutical applications.
Rapid microbiological methods face implementation challenges due to stringent validation and comparability regulations.
Current methods struggle to accurately assess the limit of detection for rapid tests detecting single microorganisms.

Purpose of the Study:

To present a novel method for precisely estimating the limit of detection (LOD) of rapid microbiological absence/presence tests.
To address the challenge of preparing spiked samples with low microbial counts for LOD determination.
To validate the efficacy of the new method in demonstrating a single microorganism detection capability.

Main Methods:

Development of the "most probable limit" method, incorporating precise microorganism quantification.
Implementation of a non-serial dilution experimental design.
Application of a robust statistical approach for LOD estimation.

Main Results:

The "most probable limit" method was successfully developed and applied.
A limit of detection of one microorganism was demonstrated for two different rapid microbiological methods.
The method overcomes limitations in preparing low-count spiked samples.

Conclusions:

The "most probable limit" method offers a precise and reliable approach for determining the LOD of rapid microbiological tests.
This advancement facilitates the validation and implementation of rapid methods in the pharmaceutical industry.
The study successfully demonstrated the capability of detecting a single microorganism, meeting critical regulatory and industry needs.