Vertical Concentration Gradient of Influenza Viruses Resuspended from Floor Dust

dc.contributor.authorKhare, Peeyushen
dc.contributor.committeechairMarr, Linsey C.en
dc.contributor.committeememberEubank, Stephen G.en
dc.contributor.committeememberBattaglia, Francineen
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessioned2014-07-22T08:00:14Zen
dc.date.available2014-07-22T08:00:14Zen
dc.date.issued2014-07-21en
dc.description.abstractResuspended floor dust constitutes up to sixty percent of the total particulate matter in indoor air. This fraction may also include virus-laden particles that settle on the floor after being emitted by an infected individual. This research focuses on predicting the concentration of influenza A viruses in resuspended dust, generated by people walking in a room, at various heights above the floor. Using a sonic anemometer, we measured the velocity field from floor to ceiling at 10-cm intervals to estimate the magnitude of turbulence generated by walking. The resulting eddy diffusion coefficients varied between 0.06 m2 s-1 and 0.20 m2 s-1 and were maximal at ~0.75-1 m above the floor, approximately the height of the swinging hand. We used these coefficients in an atmospheric transport model to predict virus concentrations as a function of the carrier particle size and height in the room. Results indicate that the concentration of resuspended viruses at 1 m above the floor is about seven times the concentration at 2 m. Thus, shorter people may be exposed to higher concentrations of pathogens in resuspended dust indoors. This study illuminates the possibility that particle resuspension could be a mode of disease transmission. It also emphasizes the importance of considering resuspension of particulate matter when designing ventilation systems and flooring in hospitals and residences.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:2841en
dc.identifier.urihttp://hdl.handle.net/10919/49662en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectwalkingen
dc.subjecteddy diffusivityen
dc.subjectinfluenza A virusen
dc.subjectindooren
dc.titleVertical Concentration Gradient of Influenza Viruses Resuspended from Floor Dusten
dc.typeThesisen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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