Effects of human activities and air purification on concentrations of airborne microorganisms and particles in a bronchoscopy room

Abstract

Objective: To evaluate the effects of human activities and air purification on concentrations of airborne microorganisms and particles in a bronchoscopy room. Methods: This study was divided into four groups：dynamic no purification group, dynamic purification group, static no purification group, static purification group, according to different conditions with/without people performing various activities and air purification. Airborne microorganisms including bacteria and fungi were detected and cultured in all air samples collected with a single stage impactor sampler, and particles were measured using a direct-reading airborne particle counter DT-9881M in five scheduled time points (0、0.5、1、2、4h). Results: The concentrations of total airborne microorganisms (bacteria plus fungi), bacteria, fungi, PM2.5 and PM2.5-10.0 were significantly higher in dynamic no purification group, compared with static no purification group，（203.20±10.92）vs（149.33±4.98）CFU/m3, (113.53±7.78)vs（84.33±3.65）CFU/m3, （89.67±7.17）vs（65.00±2.65）CFU/m3,（86557.20±4158.29）vs（45812.64±1279.61）counts/m3 and（659.69±38.91）vs（189.15±4.64）counts/m3, all p Conclusions: The findings regarding the increased microorganisms bioaerosols and particles with human activities and the inhibitory effect of air purification, are potentially important for controlling of hospital-acquired respiratory infection through bioaerosols. The study are support by Grants:SFHCCIMPGZ201400000002, SATPGD2013B031800026, SATPGZ2014J4100040