Monitoring of airborne bacteria and aerosols in different wards of hospitals - Particle counting usefulness in investigation of airborne bacteria

• Published in: Annals of Agricultural and Environmental Medicine Vol. 22; no. 4; pp. 670 - 673
• Main Authors: Mirhoseini, Seyed Hamed, Nikaeen, Mahnaz, Khanahmd, Hossein, Hatamzadeh, Maryam, Hassanzadeh, Akbar
• Format: Journal Article
• Language: English
• Published: Poland Institute of Rural Health 01-01-2015
• Subjects: Aerosols - analysis; Air Microbiology; Air pollution; Air quality; Airborne bacteria; Airborne microorganisms; Bacteria; Environmental Monitoring; Health risks; hospital infection; Hospitals; Hospitals, Teaching; Iran; Microbial contamination; Operating theaters; Outdoor air quality; particle counting; Risk reduction; Iran
• ISSN: 1232-1966; 1898-2263
• DOI: 10.5604/12321966.1185772

The presence of airborne bacteria in hospital environments is of great concern because of their potential role as a source of hospital-acquired infections (HAI). The aim of this study was the determination and comparison of the concentration of airborne bacteria in different wards of four educational hospitals, and evaluation of whether particle counting could be predictive of airborne bacterial concentration in different wards of a hospital.
The study was performed in an operating theatre (OT), intensive care unit (ICU), surgery ward (SW) and internal medicine (IM) ward of four educational hospitals in Isfahan, Iran. A total of 80 samples were analyzed for the presence of airborne bacteria and particle levels.
The average level of bacteria ranged from 75-1194 CFU/m (3) . Mean particle levels were higher than class 100,000 cleanrooms in all wards. A significant correlation was observed between the numbers of 1-5 µm particles and levels of airborne bacteria in operating theatres and ICUs. The results showed that factors which may influence the airborne bacterial level in hospital environments should be properly managed to minimize the risk of HAIs especially in operating theaters.
Microbial air contamination of hospital settings should be performed by the monitoring of airborne bacteria, but particle counting could be considered as a good operative method for the continuous monitoring of air quality in operating theaters and ICUs where higher risks of infection are suspected.