Published ahead of print on January 30, 2004, doi:10.1164/rccm.200306-760OC
American Journal of Respiratory and Critical Care Medicine Vol 169. pp. 1187-1190, (2004)
© 2004 American Thoracic Society
Detection of Airborne Rhinovirus and Its Relation to Outdoor Air Supply in Office Environments
Theodore A. Myatt,
Sebastian L. Johnston,
Zhengfa Zuo,
Matthew Wand,
Tatiana Kebadze,
Stephen Rudnick and
Donald K. Milton
Departments of Environmental Health and Biostatistics, Harvard School of Public Health, Boston, Massachusetts; and Department of Respiratory Medicine, National Heart and Lung Institute, Faculty of Medicine, Imperial College of London, London, United Kingdom
Correspondence and requests for reprints should be addressed to Donald K. Milton, M.D., Dr. PH., Department of Environmental Health, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115-6021. E-mail: dmilton{at}hsph.harvard.edu
Rhinoviruses are major causes of morbidity in patients with respiratory diseases; however, their modes of transmission are controversial. We investigated detection of airborne rhinovirus in office environments by polymerase chain reaction technology and related detection to outdoor air supply rates. We sampled air from 9 A.M. to 5 P.M. each workday, with each sample run for 1 work week. We directly extracted RNA from the filters for nested reverse transcriptasepolymerase chain reaction analysis of rhinovirus. Nasal lavage samples from building occupants with upper respiratory infections were also collected. Indoor carbon dioxide (CO2) concentrations were recorded every 10 minutes as a surrogate for outdoor air supply. To increase the range of CO2 concentrations, we adjusted the outdoor air supply rates every 3 months. Generalized additive models demonstrated an association between the probability of detecting airborne rhinovirus and a weekly average CO2 concentration greater than approximately 100 ppm, after controlling for covariates. In addition, one rhinovirus from a nasal lavage contained an identical nucleic acid sequence similar to that in the building air collected during the same week. These results suggest that occupants in buildings with low outdoor air supply may have an increased risk of exposure to infectious droplet nuclei emanating from a fellow building occupant.
Key Words: rhinovirus air sampling ventilation office buildings
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