Staphylococcus aureus infections, some second thoughts.

Area of Science:

• Microbiology
• Infectious Diseases
• Bacteriology

Background:

• Staphylococcus aureus (S. aureus) is a significant human pathogen capable of causing severe infections.
• This bacterium also commonly exists as a commensal organism on human skin and mucosal surfaces.
• The dual nature of S. aureus necessitates a thorough understanding of its pathogenic potential versus commensal carriage.

Purpose of the Study:

• To evaluate the actual threat posed by S. aureus, considering its ubiquitous presence.
• To investigate the association between S. aureus commensalism and biofilm formation.
• To identify environmental and artificial factors that trigger S. aureus biofilm development.

Main Methods:

• Review of recent findings on S. aureus carriage in various human tissues.
• Analysis of S. aureus presence in biofilms, including polymicrobial communities.
• Examination of stimuli, both natural and artificial, that promote S. aureus biofilm formation.

Main Results:

• S. aureus is abundant on skin, mucosa, and in wounds, but often without causing significant host harm.
• S. aureus frequently resides within biofilms, sometimes co-existing with other microbes.
• Biofilm formation in S. aureus can be induced by the host environment and external agents, including certain medications.

Conclusions:

• Despite its potential for severe infections, the overall risk from S. aureus appears relatively low given its widespread commensal presence.
• S. aureus forms biofilms as a response to environmental 'hazards,' with signals originating from diverse sources.
• Understanding S. aureus biofilm dynamics is crucial for effective patient treatment and management.