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Feasibility of using real-time optical methods for detecting the presence of viable bacteria aerosols at low concentrations in clean room environments
Authors:Jim Ho  Nicholas J Stanley  Thomas H Kuehn
Institution:(1) Defence Research and Development Canada Suffield, Detection and Identification Section, PO Box 4000, Station Main, Medicine Hat, AB, T1A 8K6, Canada;(2) Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
Abstract:An experimental investigation was carried out to determine the agreement between two methods of viable bacteria aerosol detection. Various amounts of Bacillus globigii (BG) spores were aerosolized in 1-s bursts into a HEPA-filtered air stream and sampled simultaneously with a fluorescence aerosol particle sensor (FLAPS) and a slit to agar biological air sampler. The slit sampler incorporated 150-mm malt extract culture plates, which were incubated at 37°C for at least 12 h before culturable BG particles were counted in terms of colony-forming units (CFU). A relationship between CFU and optically detected viable bacteria particles was determined as culturable particle concentrations decreased. Through further analytical procedures, the FLAPS showed a limit of detection (LOD) of 4.2 bacterial particle/2.5 l of sampled air or 1.7 × 103 m−3. This real-time bacteria aerosol monitor could be used to detect burst contamination events during a surgical procedure. The technology may be used for developing a dose–response relationship between bacterial particle exposure and infection, a tool potentially helpful in determining patient risk.
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