Primary postoperative wound infection due to Staphylococcus pyogenes.

Area of Science:

• Infection control in surgical environments
• Microbiology of skin flora
• Wound healing and infection prevention

Background:

• Modern operating rooms utilize plenum ventilation systems.
• Airborne infection is a concern in surgical settings, particularly with organisms like *S. pyogenes*.
• The patient's skin is an unavoidable source of potential surgical site infections.

Purpose of the Study:

• To evaluate the necessity of ultra-clean air installations in modern operating rooms.
• To assess the contribution of airborne bacteria versus skin flora to surgical wound infections.
• To identify more effective strategies for preventing surgical site infections.

Main Methods:

• Utilized *Streptococcus pyogenes* as a tracer organism to study airborne infection.
• Reviewed existing controlled trials, including hip arthroplasty studies comparing isolators to standard operating rooms.
• Analyzed the limitations of current sterilization techniques for skin.

Main Results:

• Ultra-clean air installations are likely unnecessary for most surgical procedures.
• Patient skin, which cannot be fully sterilized, remains a significant source of infection.
• Existing evidence does not demonstrate a clear advantage of isolators over meticulously managed, modern operating rooms for procedures like hip arthroplasty.

Conclusions:

• The requirement for ultra-clean air systems in operating rooms is currently 'not proved'.
• Resources may be better invested in methods to prevent skin pathogens from entering wounds.
• Further research is needed to enhance wound defense mechanisms and improve the ward environment to reduce secondary infections.