About: Exposure assessment for airborne transmission of SARS-CoV-2 via breathing, speaking, coughing and sneezing

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About: Exposure assessment for airborne transmission of SARS-CoV-2 via breathing, speaking, coughing and sneezing Goto Sponge NotDistinct Permalink

An Entity of Type : schema:ScholarlyArticle, within Data Space : covidontheweb.inria.fr associated with source document(s)

Attributes	Values
type	Academic Article research paper schema:ScholarlyArticle
isDefinedBy	Covid-on-the-Web dataset
has title	Exposure assessment for airborne transmission of SARS-CoV-2 via breathing, speaking, coughing and sneezing
Creator	Meijer, Adam Husman, Roda Maria, Ana Schijven, Jack Swart, Arno Vermeulen, Lucie
Source	MedRxiv
abstract	Background Evidence for indoor airborne transmission of SARS-CoV-2 is accumulating. If SARS-CoV-2 also spreads via aerosols, this has implications for measures taken to limit transmission. Objectives The aim of this study is to assess exposure to airborne SARS-CoV-2 particles from breathing, speaking, coughing and sneezing in an indoor environment. Methods An exposure assessment model was developed to estimate numbers of SARS-CoV-2 particles in aerosol droplets, expelled during breathing, speaking, coughing and sneezing by an infected person in an unventilated indoor environment, and subsequent inhalation by one or more persons. Scenarios encompass a range of virus concentrations, room sizes and exposure times. Results The calculated total volume of expelled aerosol droplets was highest for a sneeze, followed by a cough and speaking for 20 minutes, and lastly breathing for 20 minutes. A few to as much as tens of millions of virus particles were expelled. Exposure probability strongly depends on the viral concentration in mucus, as well as on the scenario. Exposure probabilities were generally below 1% at a virus concentration in mucus below 10^5 per mL for all scenarios, increasing steeply at different higher concentrations. According to nose / throat swab data collected from patients, 75%, 50% and 5% of infected individuals carry an estimated number of SARS-CoV-2 per mL mucus of at least 10^5, 10^6 and 10^8, respectively. Discussion Exposure to SARS-CoV-2 via aerosols generated during breathing, speaking, coughing and sneezing in an unventilated indoor environment is possible. This study forms a basis to estimate probabilities of exposure to SARS-Cov-2 by airborne transmission in indoor spaces. As long as it is uncertain what fraction of the airborne virus particles is infectious and as long as a dose response relation is lacking, it is recommended to be precautious.
has issue date	2020-07-05(xsd:dateTime)
bibo:doi	10.1101/2020.07.02.20144832
has license	medrxiv
sha1sum (hex)	4a38105234b08d510e45dbff22db12954932ddef
schema:url	https://doi.org/10.1101/2020.07.02.20144832
resource representing a document's title	Exposure assessment for airborne transmission of SARS-CoV-2 via breathing, speaking, coughing and sneezing
resource representing a document's body	covid:4a38105234b08d510e45dbff22db12954932ddef#body_text
is schema:about of	named entity 'SARS-CoV-2' named entity 'sneezing' named entity 'Exposure assessment' covid:arg/4a38105234b08d510e45dbff22db12954932ddef named entity 'SARS-CoV-2' named entity 'BACKGROUND' named entity 'coughing' named entity 'TRANSMISSION' named entity 'SNEEZING' named entity 'transmission' named entity 'Exposure assessment' named entity 'speaking' named entity 'Background' named entity 'sneezing' named entity 'airborne' named entity 'breathing' named entity 'coughing' named entity 'BREATHING' named entity 'AIRBORNE' named entity 'EXPOSURE ASSESSMENT' named entity 'COUGHING' named entity '4 5' named entity 'SARS-COV-2' named entity 'SPEAKING' named entity '3 4' nodeID://b56419954 nodeID://b56907042 nodeID://b56912386 nodeID://b57741434 nodeID://b57809546 nodeID://b57917330
is wasQuotedFrom of	covid:arg/4a38105234b08d510e45dbff22db12954932ddef/0 covid:arg/4a38105234b08d510e45dbff22db12954932ddef/1
is part of of	Background Evidence for indoor airborne transmission of SARS-CoV-2 is accumulating. If SARS-CoV-2 also spreads via aerosols, this has implications for measures taken to limit transmission. Objectives The aim of this study is to assess exposure to airborne SARS-CoV-2 particles from breathing, speaking, coughing and sneezing in an indoor environment. Methods An exposure assessment model was developed to estimate numbers of SARS-CoV-2 particles in aerosol droplets, expelled during breathing, speaking, coughing and sneezing by an infected person in an unventilated indoor environment, and subsequent inhalation by one or more persons. Scenarios encompass a range of virus concentrations, room sizes and exposure times. Results The calculated total volume of expelled aerosol droplets was highest for a sneeze, followed by a cough and speaking for 20 minutes, and lastly breathing for 20 minutes. A few to as much as tens of millions of virus particles were expelled. Exposure probability strongly depends on the viral concentration in mucus, as well as on the scenario. Exposure probabilities were generally below 1% at a virus concentration in mucus below 10^5 per mL for all scenarios, increasing steeply at different higher concentrations. According to nose / throat swab data collected from patients, 75%, 50% and 5% of infected individuals carry an estimated number of SARS-CoV-2 per mL mucus of at least 10^5, 10^6 and 10^8, respectively. Discussion Exposure to SARS-CoV-2 via aerosols generated during breathing, speaking, coughing and sneezing in an unventilated indoor environment is possible. This study forms a basis to estimate probabilities of exposure to SARS-Cov-2 by airborne transmission in indoor spaces. As long as it is uncertain what fraction of the airborne virus particles is infectious and as long as a dose response relation is lacking, it is recommended to be precautious. covid:4a38105234b08d510e45dbff22db12954932ddef#body_text Exposure assessment for airborne transmission of SARS-CoV-2 via breathing, speaking, coughing and sneezing

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