Cited by 112Infection Control and VentilationDental Research and COVID-19COVID-19 epidemiological studies

Close proximity risk assessment for SARS-CoV-2 infection

Open access
Cortellessa, G., Stabile, L., Arpino, F., Faleiros, D.E., van den Bos, W., Morawska, L., Buonanno, G.·2021·Science of The Total Environment

Abstract

Although the interpersonal distance represents an important parameter affecting the risk of infection due to respiratory viruses, the mechanism of exposure to exhaled droplets remains insufficiently characterized. In this study, an integrated risk assessment is presented for SARS-CoV-2 close proximity exposure between a speaking infectious subject and a susceptible subject. It is based on a three-dimensional transient numerical model for the description of exhaled droplet spread once emitted by a speaking person, coupled with a recently proposed SARS-CoV-2 emission approach. Particle image velocimetry measurements were conducted to validate the numerical model. The contribution of the large droplets to the risk is barely noticeable only for distances well below 0.6 m, whereas it drops to zero for greater distances where it depends only on airborne droplets. In particular, for short exposures (10 s) a minimum safety distance of 0.75 m should be maintained to lower the risk below 0.1%; for exposures of 1 and 15 min this distance increases to about 1.1 and 1.5 m, respectively. Based on the interpersonal distances across countries reported as a function of interacting individuals, cultural differences, and environmental and sociopsychological factors, the approach presented here revealed that, in addition to intimate and personal distances, particular attention must be paid to exposures longer than 1 min within social distances (of about 1 m).

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Crossref · 10.1016/j.scitotenv.2021.148749

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  • Much close transmission is through aerosols because people release considerable aerosol when talking and coughing, and aerosol is most concentrated close to the source.

    “In fact, much of the close transmission is through aerosols, because people release considerable quantities of aerosol in addition to large droplets, especially when talking and coughing,133 and also because aerosol is most concentrated close to the source, like cigarette smoke particles near a smoker.134, 135”

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  1. Crowe T.C. Multiphase Ows With Droplets and Particles 2011 CRC Press

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Authors
Cortellessa, G., Stabile, L., Arpino, F., Faleiros, D. E., van den Bos, W., Morawska, L., & Buonanno, G.
Affiliations
  • Università degli studi di Cassino e del Lazio Meridionale (IT)
  • Delft University of Technology (NL)
  • Queensland University of Technology (AU)
Corresponding author
Buonanno, G.
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-11
Volume
794
Pages
148749
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3176696325
Cited by
112
References
46
Citations by year
2026: 9 · 2025: 18 · 2024: 18 · 2023: 24 · 2022: 34 · 2021: 9
FWCI
13.75
Type
journal article
Language
en
Open access
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • QUT ePrints (Queensland University of Technology) (submittedVersion, cc-by-nc-nd)
  • Archivio Istituzionale della Ricerca - Università degli Studi di Cassino (submittedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Infection Control and Ventilation
  • Health Sciences › Dentistry › General Dentistry › Dental Research and COVID-19
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
Keywords
SARS-CoV-2, interpersonal distance, exhaled droplets, droplet spread, airborne transmission, respiratory virus transmission, risk assessment, particle image velocimetry, social distancing, exposure duration
MeSH terms
COVID-19, SARS-CoV-2, Aerosols, Humans, Risk Assessment, Exhalation

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