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Legionella pneumophila occurrence in reduced-occupancy buildings in 11 cities during the COVID-19 pandemic

Katherine Dowdell, Hannah Greenwald, Sayalee Joshi, Marianne Grimard-Conea, Sarah Pitell, Yang Song, Christian Ley, Lauren C Kennedy, Solize Vosloo, Linxuan Huo, Sarah‐Jane Haig, Kerry A. Hamilton, Kara L. Nelson, Ameet J. Pinto, Michèle Prévost, Caitlin R. Proctor, Lutgarde Raskin, Andrew J. Whelton, Emily Garner, Kelsey J. Pieper and William J. Rhoads

Article (2023)

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In spring 2020, numerous buildings were closed or operated at reduced occupancies to slow the spread of COVID-19. An unintended consequence of these social distancing measures was a reduction in water demand in many buildings. Concerns arose that contaminants associated with water stagnation, such as Legionella pneumophila, could become prevalent. To investigate the potential public health risk associated with L. pneumophila, samples from 26 reduced-occupancy buildings in 11 cities in the United States, Canada, and Switzerland were analyzed for L. pneumophila using liquid culture (Legiolert, n = 258) and DNA-based methods (qPCR/ddPCR, n = 138). L. pneumophila culture-positivity was largely associated with five buildings, each of which had specific design or operational deficiencies commonly associated with L. pneumophila occurrence. Samples from buildings with free chlorine residual disinfection had higher culture-positivity (37%) than samples from buildings with chloramine (1%). Additionally, 78% of culture-positive samples occurred when the disinfectant residual was ≤0.1 mg L−1 Cl2 and only three free chlorine samples were culture-positive when the disinfectant residual was >0.2 mg L−1 as Cl2. Although overall sample positivity using culture- and DNA-based methods was equivalent (34% vs. 35%), there was disagreement between the methods in 13% of samples (n = 18 of 138). Few buildings reported any water management activities, and L. pneumophila concentrations in flushed samples were occasionally greater than in first-draw samples. This study provides insight into how building plumbing characteristics and water management practices contribute to L. pneumophila occurrence during low water use periods and can inform targeted prevention and mitigation efforts.

Subjects: 1000 Civil engineering > 1000 Civil engineering
Department: Department of Civil, Geological and Mining Engineering
Funders: National Science Foundation, Water Research Foundation, Purdue University, University of Michigan, Arizona State University, University of Pittsburgh, Horace H. Rackham School of Graduate Studies, Eidgenössische Anstalt für Wasserversorgung Abwasserreinigung und Gewässerschutz
Grant number: DGE-1256260, CBET-2039498, CBET-1749530, CBET-2029850, DGE-1752814, CBET-2027049, Project 4721, Lilian Gilbreth Postdoctoral Fellowship, Blue Sky Grant, Engineering Start-up Funds, Central Development Research Award, Predoctoral Fellowship
PolyPublie URL: https://publications.polymtl.ca/55997/
Journal Title: Environmental science (vol. 9, no. 11)
Publisher: Royal Society of Chemistry
DOI: 10.1039/d3ew00278k
Official URL: https://doi.org/10.1039/d3ew00278k
Date Deposited: 10 Nov 2023 11:55
Last Modified: 07 Dec 2023 11:15
Cite in APA 7: Dowdell, K., Greenwald, H., Joshi, S., Grimard-Conea, M., Pitell, S., Song, Y., Ley, C., Kennedy, L. C., Vosloo, S., Huo, L., Haig, S.‐J., Hamilton, K. A., Nelson, K. L., Pinto, A. J., Prévost, M., Proctor, C. R., Raskin, L., Whelton, A. J., Garner, E., ... Rhoads, W. J. (2023). Legionella pneumophila occurrence in reduced-occupancy buildings in 11 cities during the COVID-19 pandemic. Environmental science, 9(11), 2847-2865. https://doi.org/10.1039/d3ew00278k


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