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Antimicrobial Effectiveness

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...

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Updated: Jul 13, 2025

Antimicrobial Characterization of Advanced Materials for Bioengineering Applications

Antimicrobial Characterization of Advanced Materials for Bioengineering Applications

Published on: August 4, 2018

In vitro comparison of methods for sampling copper-based antimicrobial surfaces.

T C Williams¹, T Woznow¹, B Velapatino¹

¹Division of Medical Microbiology and Infection Prevention, Vancouver Coastal Health , Vancouver, British Columbia, Canada.

Microbiology Spectrum

|October 17, 2023

Summary

Directly using Petrifilm on copper surfaces can falsely inflate bacterial counts by reviving stressed cells. Indirect methods provide more accurate assessments of copper

Keywords:

Cu surfaces antibacterial measurement infection control self-disinfecting surfaces

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Published on: April 18, 2019

Area of Science:

Microbiology
Materials Science
Infection Control

Background:

Self-sanitizing surfaces, particularly copper (Cu), are vital for reducing pathogen transmission on high-touch surfaces.
Accurate enumeration of bacteria is crucial for validating the antimicrobial efficacy of these surfaces.
Existing literature lacks comprehensive studies on reliable bacterial enumeration methods for copper surfaces.

Purpose of the Study:

To investigate the impact of bacterial collection methods on the perceived antimicrobial efficacy of copper surfaces.
To determine if direct plating on copper influences bacterial viability and subsequent counts.
To identify reliable methods for assessing the true antimicrobial properties of copper.

Main Methods:

Comparison of bacterial counts obtained from direct plating of samples onto Petrifilm.
Evaluation of bacterial counts using indirect sample collection methods from copper surfaces.
Analysis of potential revival of stressed or dying bacteria due to direct contact with copper.

Main Results:

Direct application of Petrifilm onto copper surfaces led to an overestimation of bacterial counts.
This overestimation is attributed to the revival of stressed and dying bacteria on the copper surface.
Indirect collection methods did not exhibit this revival phenomenon, yielding more accurate counts.

Conclusions:

The method of bacterial collection significantly impacts the assessment of copper's antimicrobial efficacy.
Direct plating on copper surfaces can lead to artifactually high bacterial counts, masking true efficacy.
Indirect sampling methods are recommended for accurate time-kill kinetics and long-term efficacy studies of copper surfaces.