Environmental Stability and Transmission Dynamics of SARS-CoV-2
Summary
The environmental stability of SARS-CoV-2 underpins its capacity to spread via aerosols, respiratory droplets, contaminated surfaces and, in some instances, faecal matter. Survival times vary widely with temperature, humidity and surface composition, influencing the likelihood of fomite transmission in both community and healthcare settings. Concurrently, the mechanics of airborne spread are governed by the physical properties of exhaled particles and the number of virions required to establish infection, often termed the transmission bottleneck. Together, these factors determine infection risk in indoor and outdoor environments, inform disinfection protocols, and guide the design of personal protective equipment and ventilation strategies. A comprehensive understanding of these dynamics is critical to minimise global transmission and to develop proportionate public health interventions.
Research from Nature Portfolio
Recent studies have shown that physical modelling of airborne transmission predicts consistently small numbers of virions initiating new infections, providing a mechanistic explanation for observed transmission bottlenecks across respiratory viruses. This work emphasises the predominance of low-dose exposures in most transmission events, highlighting the value of measures that reduce inhaled particle concentration, such as mask use and improved ventilation. In parallel, investigations into virus persistence on personal protective equipment revealed that, in the presence of organic soiling, infectious SARS-CoV-2 can remain viable on non-porous materials for up to three weeks. Conversely, porous fabrics such as cotton support rapid viral decay, suggesting material selection and decontamination procedures are pivotal in reducing risk in healthcare environments.
Environmental Stability and Transmission Dynamics of SARS-CoV-2 publication trend
The graph below shows the total number of articles in environmental stability and transmission dynamics of sars-cov-2 across all publications each year (not limited to Nature Index journals).
Technical terms
Transmission bottleneck: The number of viral particles that successfully initiate infection in a new host.
Fomite transmission: Spread of virus via contact with contaminated surfaces or objects.
Half-life (environmental): Time required for half of the infectious virus particles on a surface to lose viability.
Relative humidity: Ratio of water vapour in air to the maximum it can hold at a given temperature, affecting viral stability.
Aerosol: Suspension of fine liquid or solid particles in air capable of long-range transport and inhalation.
References
- The airborne transmission of viruses causes tight transmission bottlenecks. Nature Communications (2024).
- Stability of SARS-CoV-2 on critical personal protective equipment. Scientific Reports (2021).
- The effect of temperature on persistence of SARS-CoV-2 on common surfaces. Virology Journal (2020).
- Increasing Temperature and Relative Humidity Accelerates Inactivation of SARS-CoV-2 on Surfaces. mSphere (2020).
- Potential fecal transmission of SARS-CoV-2: Current evidence and implications for public health. International Journal of Infectious Diseases (2020).
About these summaries
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