Characterization and deposition of respirable large- and small-particle bioaerosols.

Applied and Environmental Microbiology
Richard J ThomasRichard W Titball

Abstract

The deposition patterns of large-particle microbiological aerosols within the respiratory tract are not well characterized. A novel system (the flow-focusing aerosol generator [FFAG]) which enables the generation of large (>10-microm) aerosol particles containing microorganisms under laboratory conditions was characterized to permit determination of deposition profiles within the murine respiratory tract. Unlike other systems for generating large aerosol particles, the FFAG is compatible with microbiological containment and the inhalational challenge of animals. By use of entrapped Escherichia coli cells, Bacillus atrophaeus spores, or FluoSphere beads, the properties of aerosols generated by the FFAG were compared with the properties of aerosols generated using the commonly available Collison nebulizer, which preferentially generates small (1- to 3-microm) aerosol particles. More entrapped particulates (15.9- to 19.2-fold) were incorporated into 9- to 17-microm particles generated by the FFAG than by the Collison nebulizer. The 1- to 3-microm particles generated by the Collison nebulizer were more likely to contain a particulate than those generated by the FFAG. E. coli cells aerosolized using the FFAG survived better than tho...Continue Reading

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