Indoor Model Simulation for COVID-19 Transport and Exposure

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Hussein , T , Löndahl , J , Thuresson , S , Alsved , M , Al-Hunaiti , A , Saksela , K , Aqel , H , Junninen , H , Mahura , A & Kulmala , M 2021 , ' Indoor Model Simulation for COVID-19 Transport and Exposure ' , International Journal of Environmental Research and Public Health , vol. 18 , no. 6 , 2927 .

Title: Indoor Model Simulation for COVID-19 Transport and Exposure
Author: Hussein, Tareq; Löndahl, Jakob; Thuresson, Sara; Alsved, Malin; Al-Hunaiti, Afnan; Saksela, Kalle; Aqel, Hazem; Junninen, Heikki; Mahura, Alexander; Kulmala, Markku
Contributor organization: Institute for Atmospheric and Earth System Research (INAR)
Kalle Saksela / Principal Investigator
Department of Virology
INAR Physics
Date: 2021-03-12
Language: eng
Number of pages: 16
Belongs to series: International Journal of Environmental Research and Public Health
ISSN: 1661-7827
Abstract: Transmission of respiratory viruses is a complex process involving emission, deposition in the airways, and infection. Inhalation is often the most relevant transmission mode in indoor environments. For severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the risk of inhalation transmission is not yet fully understood. Here, we used an indoor aerosol model combined with a regional inhaled deposited dose model to examine the indoor transport of aerosols from an infected person with novel coronavirus disease (COVID-19) to a susceptible person and assess the potential inhaled dose rate of particles. Two scenarios with different ventilation rates were compared, as well as adult female versus male recipients. Assuming a source strength of 10 viruses/s, in a tightly closed room with poor ventilation (0.5 h−1), the respiratory tract deposited dose rate was 140–350 and 100–260 inhaled viruses/hour for males and females; respectively. With ventilation at 3 h−1 the dose rate was only 30–90 viruses/hour. Correcting for the half-life of SARS-CoV-2 in air, these numbers are reduced by a factor of 1.2–2.2 for poorly ventilated rooms and 1.1–1.4 for well-ventilated rooms. Combined with future determinations of virus emission rates, the size distribution of aerosols containing the virus, and the infectious dose, these results could play an important role in understanding the full picture of potential inhalation transmission in indoor environments.
Subject: 114 Physical sciences
expiratory droplet
inhaled dose
indoor aerosol modeling
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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