Artificial Human Sweat as a Novel Growth Condition for Clinically Relevant Pathogens on Hospital Surfaces

Area of Science:

• Microbiology
• Infectious Diseases
• Biomedical Engineering

Background:

• Dry hospital surfaces can harbor biofilms, posing infection risks.
• Existing biofilm models often use unrealistic nutrient-rich, hydrated conditions.
• Understanding dry surface biofilm formation is crucial for infection control.

Purpose of the Study:

• To develop a more clinically relevant model for dry surface biofilms.
• To assess the suitability of artificial human sweat (AHS) as a culture medium.
• To evaluate AHS's ability to support clinically relevant pathogen biofilm formation.

Main Methods:

• Development of a novel artificial human sweat (AHS) culture medium.
• Culturing four multidrug-resistant pathogens: Acinetobacter baumannii, Staphylococcus aureus, Enterococcus faecalis, and Pseudomonas aeruginosa.
• Microscopic analysis and quantification of biofilm formation.

Main Results:

• AHS sustained the proliferation and biofilm formation of tested pathogens.
• Biofilm concentrations in the AHS model were comparable to in situ levels (average 6.00 log10 CFU/cm2).
• Microscopic analysis revealed visual characteristics similar to clinical dry surface biofilms.

Conclusions:

• Artificial human sweat (AHS) provides a representative nutrient source for dry surface biofilms.
• The AHS model accurately mimics clinical dry surface biofilms.
• This model can be used for improved efficacy testing of hospital cleaning agents and understanding surface hygiene.