Cited by 890Infection Control and VentilationRespiratory viral infections researchCOVID-19 epidemiological studies

Transmissibility and transmission of respiratory viruses

Open access
Leung, Nancy H. L.·2021·Nature Reviews Microbiology

Abstract

Human respiratory virus infections lead to a spectrum of respiratory symptoms and disease severity, contributing to substantial morbidity, mortality and economic losses worldwide, as seen in the COVID-19 pandemic. Belonging to diverse families, respiratory viruses differ in how easy they spread (transmissibility) and the mechanism (modes) of transmission. Transmissibility as estimated by the basic reproduction number (R 0) or secondary attack rate is heterogeneous for the same virus. Respiratory viruses can be transmitted via four major modes of transmission: direct (physical) contact, indirect contact (fomite), (large) droplets and (fine) aerosols. We know little about the relative contribution of each mode to the transmission of a particular virus in different settings, and how its variation affects transmissibility and transmission dynamics. Discussion on the particle size threshold between droplets and aerosols and the importance of aerosol transmission for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and influenza virus is ongoing. Mechanistic evidence supports the efficacies of non-pharmaceutical interventions with regard to virus reduction; however, more data are needed on their effectiveness in reducing transmission. Understanding the relative contribution of different modes to transmission is crucial to inform the effectiveness of non-pharmaceutical interventions in the population. Intervening against multiple modes of transmission should be more effective than acting on a single mode.

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  • Physical interventions might prevent the spread of respiratory viruses transmitted by multiple modes including respiratory particles and direct/indirect contact.

    “Physical interventions, such as the use of masks and physical distancing measures, might prevent the spread of respiratory viruses which are considered to be transmitted by multiple modes of transmission including by respiratory particles of varying sizes spreading from infected to susceptible people and through direct and indirect contact (Kutter 2018; Leung 2021).”

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Research works printed but not linked: 6

  1. [48]Hinds, W. C. Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles (John Wiley & Sons, 2012).
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Authors
Leung, N. H. L.
Affiliations
University of Hong Kong (HK)
Corresponding author
Leung, Nancy H. L.
Venue
Nature Reviews Microbiology
Published
2021-03-22
Volume
19
Issue
8
Pages
528-545
ISSN
  • 1740-1526 (ISSN-L)
  • 1740-1534
OpenAlex
W3136166083
Cited by
890
References
244
Citations by year
2026: 98 · 2025: 171 · 2024: 169 · 2023: 189 · 2022: 191 · 2021: 72
FWCI
25.22
Type
journal article
Language
en
Open access
Locations
  • Nature Reviews Microbiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
University Grants Committee (T11-712/19 N)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Infection Control and Ventilation
  • Health Sciences › Medicine › Epidemiology › Respiratory viral infections research
  • Physical Sciences › Mathematics › Modeling and Simulation › COVID-19 epidemiological studies
Keywords
respiratory viruses, viral transmissibility, transmission routes, basic reproduction number, secondary attack rate, droplet transmission, airborne transmission, fomite transmission, direct contact transmission, SARS-CoV-2, COVID-19 pandemic, influenza virus, non-pharmaceutical interventions, particle size threshold
MeSH terms
Personal Protective Equipment, COVID-19, SARS-CoV-2, Aerosols, Humans, Hygiene

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