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The effect of body position while coughing on the airborne transmission of pathogens
Shiraz Univ, Sch Mech Engn, Shiraz, Iran..
Shiraz Univ, Sch Mech Engn, Shiraz, Iran..
Univ Copenhagen, Dept Chem, Copenhagen, Denmark..
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Sustainable Buildings.ORCID iD: 0000-0002-9361-1796
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2022 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 34, no 4, p. 041902-, article id 041902Article in journal (Refereed) Published
Abstract [en]

Given the recent acceptance of the central role of airborne transmission for SARS-CoV-2, increased attention has been paid to the dispersion of respiratory droplets in different scenarios. Studies including numerical simulations have been conducted on methods for breaking the chains of transmission. Here, we present the first such study on the impact of body position while coughing on the dispersion of respiratory droplets. Four scenarios are examined, including normal standing, bending the head at different angles, coughing into the elbow in still air, and a gentle breeze from the front and behind. The model showed that an uncovered cough is dangerous and causes many droplets to enter the environment, posing a cross-contamination threat to the others. Droplets with an initial diameter smaller than 62.5 mu m remain suspended in windless air for more than 3 min. In the presence of wind, these droplets move with the wind flow and may travel long distances greater than 3.5 m. The model showed that covering the mouth with the elbow while coughing is clearly the best strategy for reducing airborne transmission of exhaled pathogens. About 62% of the initial number of droplets deposit on the cougher's elbow immediately after the cough and have no chance of spreading through the air in both windless and windy conditions. Covering the cough in windless or light breeze conditions also causes the upward thermal plume around the body to expel many small droplets.

Place, publisher, year, edition, pages
AIP Publishing , 2022. Vol. 34, no 4, p. 041902-, article id 041902
National Category
Respiratory Medicine and Allergy
Identifiers
URN: urn:nbn:se:kth:diva-312814DOI: 10.1063/5.0086241ISI: 000788837600011Scopus ID: 2-s2.0-85128374589OAI: oai:DiVA.org:kth-312814DiVA, id: diva2:1660145
Note

QC 20220523

Available from: 2022-05-23 Created: 2022-05-23 Last updated: 2022-06-25Bibliographically approved

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Sadrizadeh, SasanAbouali, Omid

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