Cited by 449Infection Control and VentilationCOVID-19 epidemiological studiesCOVID-19 impact on air quality

Quantitative assessment of the risk of airborne transmission of SARS-CoV-2 infection: prospective and retrospective applications

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Buonanno, G., Morawska, L., Stabile, L.·2020·Environment International

Published version of a preprint

Abstract

Airborne transmission is a recognized pathway of contagion; however, it is rarely quantitatively evaluated. The numerous outbreaks that have occurred during the SARS-CoV-2 pandemic are putting a demand on researchers to develop approaches capable of both predicting contagion in closed environments (predictive assessment) and analyzing previous infections (retrospective assessment). This study presents a novel approach for quantitative assessment of the individual infection risk of susceptible subjects exposed in indoor microenvironments in the presence of an asymptomatic infected SARS-CoV-2 subject. The application of a Monte Carlo method allowed the risk for an exposed healthy subject to be evaluated or, starting from an acceptable risk, the maximum exposure time. We applied the proposed approach to four distinct scenarios for a prospective assessment, highlighting that, in order to guarantee an acceptable risk of 10−3 for exposed subjects in naturally ventilated indoor environments, the exposure time could be well below one hour. Such maximum exposure time clearly depends on the viral load emission of the infected subject and on the exposure conditions; thus, longer exposure times were estimated for mechanically ventilated indoor environments and lower viral load emissions. The proposed approach was used for retrospective assessment of documented outbreaks in a restaurant in Guangzhou (China) and at a choir rehearsal in Mount Vernon (USA), showing that, in both cases, the high attack rate values can be justified only assuming the airborne transmission as the main route of contagion. Moreover, we show that such outbreaks are not caused by the rare presence of a superspreader, but can be likely explained by the co-existence of conditions, including emission and exposure parameters, leading to a highly probable event, which can be defined as a “superspreading event”.

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  • Laboratory, field, modelling, and case studies have shown that airborne transmission through inhalation of virus-laden aerosol is important, if not dominant, for COVID-19.

    “Laboratory, field, modelling, and case studies have shown that airborne transmission through the inhalation of a virus-laden aerosol is important, if not dominant, for COVID-19.119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132”

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  1. World Health Organization, 2011. Guidelines for Drinking-water Quality - 4th Edition. WHO Regional Office for Europe.

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Authors
Buonanno, G., Morawska, L., & Stabile, L.
Affiliations
  • Queensland University of Technology (AU)
  • Università degli studi di Cassino e del Lazio Meridionale (IT)
Corresponding author
Stabile, L.
Venue
Environment International
Publisher
Elsevier BV
Published
2020-12
Volume
145
Pages
106112
ISSN
0160-4120 (ISSN-L)
OpenAlex
W3083235507
Cited by
449
References
46
Citations by year
2026: 20 · 2025: 48 · 2024: 55 · 2023: 78 · 2022: 96 · 2021: 117 · 2020: 35
FWCI
45.83
Type
journal article
Language
en
Open access
Locations
  • Environment International (publishedVersion, cc-by)
  • medRxiv (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • QUT ePrints (Queensland University of Technology) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Archivio Istituzionale della Ricerca - Università degli Studi di Cassino (submittedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Infection Control and Ventilation
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
  • Physical Sciences › Environmental Science › Global and Planetary Change › COVID-19 impact on air quality
Keywords
SARS-CoV-2, airborne transmission, infection risk assessment, indoor microenvironments, asymptomatic infection, exposure time, superspreading events, superspreaders, outbreak investigation, Monte Carlo simulation, attack rate
MeSH terms
Betacoronavirus, COVID-19, SARS-CoV-2, Aerosols, China, Humans, Pneumonia, Viral, Prospective Studies, Retrospective Studies, Air Pollution, Indoor, Coronavirus, Coronavirus Infections, Risk Assessment, Pandemics

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