Aerosol Microdroplets Inefficient Carriers Of COVID-19 Virus

Modeling shows SARS-CoV2 isn’t spread very well by the small droplets that linger longest
American Institute of Physics (AIP)

Newswise — WASHINGTON, October 27, 2020 -- Aerosol microdroplets, the tiny particles that linger in the air longest after we talk, cough, or sneeze, do not appear to be extremely efficient at spreading the virus that leads to COVID-19.

Modeling of SARS-CoV-2 transmission in confined spaces suggests aerosol transmission is not a very efficient route. The results were published in Physics of Fluids, by AIP Publishing.

Physicists and medical doctors at the University of Amsterdam’s Van der Waals-Zeeman Institute used laser technology to measure the distribution of droplets released when people speak or cough. Test subjects spoke or coughed into a laser beam, and a jet nozzle was used to mimic tiny aerosol microdroplets. This allowed researchers to measure how droplets spread and how likely they are to pass along SARS-CoV2.

While the lingering microdroplets are certainly not risk-free, due to their small size, they contain less virus than the larger droplets that are produced when someone coughs, speaks, or sneezes directly on us, said Daniel Bonn, one of the authors and institute director.

“Based on the current insights, we actually see that aerosol-wise, it’s relatively safe to go into well-ventilated modern buildings, such as airports, train stations, modern offices, etc.,” Bonn said. “Modern ventilation makes the aerosol infection risk not very large. The amount of virus in the small droplets is relatively small, meaning that it becomes dangerous if you’re in a badly ventilated room for a relatively long time with an infected person or after an infected person has coughed there.”

If someone enters a space even a few minutes after a mildly symptomatic carrier of the coronavirus has coughed in that area, the probability of infection is “rather low,” according to the researchers. It is even lower if that person was only talking.

The findings, Bonn said, support the efficacy of wearing masks, social distancing, and other measures targeting the spread of larger droplets.

“They are so large that they fall onto the ground roughly within a meter from your mouth,” he said. “If you want to minimize the risk of infection, you need to not only keep the 6 feet, or 1.5 meters, but also make sure the room you are in is well ventilated. And wash your hands.”

The researchers acknowledge the study’s findings are “necessarily subjective.” But, Bonn said, the authors hope it provides some context as people consider their safety during the pandemic.

###

The article, “Aerosol persistence in relation to possible transmission of SARS-CoV-2,” is authored by Daniel Bonn, Scott H Smith, Aernout Somsen, Cees van Rijn, Stefan Kooij, Lia van der Hoek, and Reinout Alexander Bem. The article will appear in Physics of Fluids on Oct. 27, 2020 (DOI: 10.1063/5.0027844). After that date, it can be accessed at https://aip.scitation.org/doi/10.1063/5.0027844.

ABOUT THE JOURNAL

Physics of Fluids is devoted to the publication of original theoretical, computational, and experimental contributions to the dynamics of gases, liquids, and complex or multiphase fluids. See https://aip.scitation.org/journal/phf.

###

SEE ORIGINAL STUDY



Filters close

Showing results

110 of 6054
access_time Embargo lifts in 2 days
Embargo will expire: 26-Jul-2021 11:00 AM EDT Released to reporters: 23-Jul-2021 5:05 PM EDT

A reporter's PressPass is required to access this story until the embargo expires on 26-Jul-2021 11:00 AM EDT The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

Newswise: NIH Chooses University of Miami Miller School of Medicine to Head Project for Its Safe Return to In-Person School Initiative
Released: 23-Jul-2021 12:15 PM EDT
NIH Chooses University of Miami Miller School of Medicine to Head Project for Its Safe Return to In-Person School Initiative
University of Miami Health System, Miller School of Medicine

The University of Miami Miller School of Medicine is helping to lead a National Institutes of Health (NIH) COVID-19 testing initiative to safely return children to in-person school.

Released: 23-Jul-2021 11:40 AM EDT
New 'Atlas' Charts How Antibodies Attack Spike Protein Variants
Brigham and Women’s Hospital

As the SARS-CoV-2 virus that causes COVID-19 continues to evolve, immunologists and infectious diseases experts are eager to know whether new variants are resistant to the human antibodies that recognized initial versions of the virus.

23-Jul-2021 8:55 AM EDT
COVID Variants and a Surge Among the Unvaccinated: Live Expert Panel for July 23rd, 2021
Newswise

Panelists will discuss the threat posed by new COVID variants and continued vaccine hesitancy.

Released: 22-Jul-2021 4:05 PM EDT
COVID-19: Patients with Malnutrition May Be More Likely to Have Severe Outcomes
Scientific Reports

Adults and children with COVID-19 who have a history of malnutrition may have an increased likelihood of death and the need for mechanical ventilation, according to a study published in Scientific Reports.

access_time Embargo lifts in 2 days
Embargo will expire: 27-Jul-2021 4:05 PM EDT Released to reporters: 22-Jul-2021 3:05 PM EDT

A reporter's PressPass is required to access this story until the embargo expires on 27-Jul-2021 4:05 PM EDT The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

access_time Embargo lifts in 2 days
Embargo will expire: 26-Jul-2021 4:05 PM EDT Released to reporters: 22-Jul-2021 2:45 PM EDT

A reporter's PressPass is required to access this story until the embargo expires on 26-Jul-2021 4:05 PM EDT The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

Released: 22-Jul-2021 2:35 PM EDT
New Insights Into Uncontrolled Inflammation in COVID-19 Patients
Queen Mary University of London

In a new study, published recently in the journal Circulation Research, scientists discover how the production of protective molecules known as specialised pro-resolving mediators (SPM) is altered in patients with COVID-19.

Released: 22-Jul-2021 2:30 PM EDT
度假旅行者需要了解的COVID-19相关信息
Mayo Clinic

许多人会利用国家法定假日出门旅行或举办聚会。由于仍有许多人需要接种COVID-19疫苗以及传染性更强的Delta变种疫苗,因此健康专家建议,如果您计划旅行或召集很多人聚会,请务必谨慎。


Showing results

110 of 6054

close
1.85933