Design and validation of a novel quantitative method for rapid bacterial enumeration using programmed stage movement...

Area of Science:

• Biomedical Engineering
• Microbiology
• Materials Science

Background:

• Bacterial adhesion to surgical implants initiates infection.
• Accurate bacterial enumeration is crucial for studying implant colonization.
• Current direct visualization methods are time-consuming.

Purpose of the Study:

• To develop and validate a rapid method for enumerating bacteria on porous implant surfaces.
• To compare a novel scanning electron microscopy (SEM) technique with absolute bacterial counts.
• To assess the efficiency of this method for surgical mesh analysis.

Main Methods:

• Utilized programmed stage movement SEM for bacterial enumeration on porous materials.
• Tested the method on three commercial abdominal wall hernia repair meshes.
• Used three different inoculums of Staphylococcus epidermidis.
• Compared cumulative bacterial counts with absolute counts.

Main Results:

• A significant correlation was found between cumulative counts and absolute counts after five cumulative counts.
• The novel method demonstrated time savings of approximately 1 hour and 9 minutes per mesh.
• The method proved effective across different meshes and bacterial concentrations.

Conclusions:

• Automated SEM stage control enables rapid bacterial data acquisition.
• Five cumulative SEM counts provide a valid quantitative method for enumerating bacteria on porous surfaces up to 1.3 mm pore size.
• This technique offers a faster alternative for bacterial quantification in implant infection studies.