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Review
. 2019 Jan 31;19(1):101.
doi: 10.1186/s12879-019-3707-y.

Recognition of aerosol transmission of infectious agents: a commentary

Raymond Tellier  1 , Yuguo Li  2 , Benjamin J Cowling  3 , Julian W Tang  4   5
Affiliations
Review

Recognition of aerosol transmission of infectious agents: a commentary

Raymond Tellier et al. BMC Infect Dis. .

Abstract

Although short-range large-droplet transmission is possible for most respiratory infectious agents, deciding on whether the same agent is also airborne has a potentially huge impact on the types (and costs) of infection control interventions that are required.The concept and definition of aerosols is also discussed, as is the concept of large droplet transmission, and airborne transmission which is meant by most authors to be synonymous with aerosol transmission, although some use the term to mean either large droplet or aerosol transmission.However, these terms are often used confusingly when discussing specific infection control interventions for individual pathogens that are accepted to be mostly transmitted by the airborne (aerosol) route (e.g. tuberculosis, measles and chickenpox). It is therefore important to clarify such terminology, where a particular intervention, like the type of personal protective equipment (PPE) to be used, is deemed adequate to intervene for this potential mode of transmission, i.e. at an N95 rather than surgical mask level requirement.With this in mind, this review considers the commonly used term of 'aerosol transmission' in the context of some infectious agents that are well-recognized to be transmissible via the airborne route. It also discusses other agents, like influenza virus, where the potential for airborne transmission is much more dependent on various host, viral and environmental factors, and where its potential for aerosol transmission may be underestimated.

Keywords: Aerosol; Airborne; Droplet; Infection; Transmission.

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Ethics approval and consent to participate

Not required. No individual patient information is included. Only previously published papers are discussed.

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Not applicable.

Competing interests

None of the authors have any competing interests to declare.

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Figures

Fig. 1
Fig. 1
An illustration of various possible transmission routes of respiratory infection between an infected and a susceptible individual. Both close range (i.e. conversational) airborne transmission and longer range (over several meters) transmission routes are illustrated here. The orange head colour represents a source and the white head colour a potential recipient (with the bottom right panel indicating that both heads are potential recipients via self-inoculation from contaminated surface fomite sources). Here ‘Expiration’ also includes normal breathing exhalation, as well as coughing and/or sneezing airflows. Airborne droplets can then settle on surfaces (fomites) from where they can be touched and carried on hands leading to further self-inoculation routes of transmission
See this image and copyright information in PMC

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