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Updated: Jan 28, 2026

Fast Colony Forming Unit Counting in 96-Well Plate Format Applied to the Drosophila Microbiome

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Published on: January 13, 2023

Colony Count Accuracy Using Selective Media: Analysts Versus Automatic Colony Counters ^1, ².

Linda S Guthertz¹, John T Fruin¹

¹Letterman Army Institute of Research, Department of Nutrition, Food Hygiene Division, Presidio of San Francisco, California 94129.

Journal of Food Protection

|March 1, 2019

Summary

This summary is machine-generated.

Manual colony counting on selective bacteriologic media proved superior to automated methods. This pilot study highlights manual enumeration

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Area of Science:

Microbiology
Bacteriology

Background:

Accurate enumeration of bacterial colonies is crucial for microbiological analysis.
Automated colony counters offer potential for increased efficiency, but their accuracy on selective media requires validation.

Purpose of the Study:

To compare the accuracy of manual versus automated colony counting methods.
To evaluate the performance of different automated colony counters on various selective bacteriologic media.

Main Methods:

Five analysts performed manual colony counts using a Quebec colony counter and hand tally.
The same analysts subsequently used three different automated colony counters for enumeration.
Selective media included violet red bile agar, KF streptococcal agar, sulfite-polymyxin-sulfadiazine agar, and Standard Methods agar with TTC.

Main Results:

Manual colony counting demonstrated superior accuracy compared to automated methods.
Variability in results was observed across different automated colony counting systems.

Conclusions:

Manual enumeration remains the gold standard for accurate colony counting on selective bacteriologic media.
Further development and validation of automated colony counters are needed for reliable use in microbiology.