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PNAS-The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission

Gert van der Hoek

In Memoriam - Editor, Senior Moderator
PNAS first published May 13, 2020 https://doi.org/10.1073/pnas.2006874117

Abstract

Speech droplets generated by asymptomatic carriers of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are increasingly considered to be a likely mode of disease transmission.

Highly sensitive laser light scattering observations have revealed that loud speech can emit thousands of oral fluid droplets per second.

In a closed, stagnant air environment, they disappear from the window of view with time constants in the range of 8 to 14 min, which corresponds to droplet nuclei of ca. 4 μm diameter, or 12- to 21-μm droplets prior to dehydration.

These observations confirm that there is a substantial probability that normal speaking causes airborne virus transmission in confined environments.


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Simply talking in confined environments could lead to coronavirus transmission, researchers say

May 14, 2020

The droplets from simply talking can be enough to spread the coronavirus, according to researchers.

By using lasers, scientists found that one minute of talking loudly can produce more than 1,000 virus-containing droplets that could linger in the air for over 8 minutes, according to a new study published in the Proceedings of the National Academy of Sciences of the United States of America.

As states continue to gradually reopen, scientists fear that reopening too soon could worsen the virus outbreak. Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, testified in front of a Senate panel Tuesday and said the consequences for states reopening without following proper guidelines "could be really serious."

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