Environmental air and airborne infections

Area of Science:

• Surgical Infections
• Epidemiology
• Microbiology

Background:

• Surgical site infections (SSIs) are a significant concern in healthcare.
• The role of airborne microorganisms in SSIs has been debated.
• Modern operating rooms feature advanced air filtration and ventilation systems.

Purpose of the Study:

• To compare the incidence of surgical infections in operating rooms with and without advanced environmental controls.
• To identify the primary sources and timing of microbial contamination leading to surgical infections.

Main Methods:

• A comparative study involving 156 major surgical procedures across two operating room environments.
• Collection of extensive cultures from patients, surgical personnel, and the environment.
• Microbial analysis for common bacterial pathogens including staphylococci, streptococci, and Gram-negative bacilli.

Main Results:

• No significant difference in infection rates was observed between the basic and advanced operating room environments.
• Environmental air was an infrequent source of surgical pathogens.
• The patient and perioperative personnel were identified as the predominant sources of infection.

Conclusions:

• Advanced ventilation and air control systems do not significantly reduce surgical infection rates.
• Meticulous adherence to aseptic principles is more critical for infection prevention than elaborate air handling.
• Contamination primarily occurs during the surgical procedure from endogenous or staff-related sources.