Apr 6, 2020
Those infected with CoVid19 but asymptomatic could spew virus as they speak. Aerosol engineers at UCDavis raise this possibility as the result of their studies of respiratory particles generated by speech.
Their studies reveal that particles spring from lung fluids, waft up airways, and spew out the mouth as you speak. Louder speech generates more particles. Droplets spread farther as they dry.
The droplets generated would be stopped by N95 masks but many go right through simple cloth masks. There’s no proof yet that such droplets have virus, but chances are.....
The bottom line: stay up to 30 feet from non-family. A mask or bandana helps but won’t completely protect you.
Sima Asadi, Nicole Bouvier, Anthony S. Wexler, William D. Ristenpart. The coronavirus pandemic and aerosols: Does COVID-19 transmit via expiratory particles? Aerosol Science and Technology, 2020; 1 DOI: 10.1080/02786826.2020.1749229
Sima Asadi, Anthony S. Wexler, Christopher D. Cappa, Santiago Barreda, Nicole M. Bouvier, William D. Ristenpart. Aerosol emission and superemission during human speech increase with voice loudness. Scientific Reports, 2019; 9 (1) DOI: 10.1038/s41598-019-38808-z
Sima Asadi, Anthony S. Wexler, Christopher D. Cappa, Santiago Barreda, Nicole M. Bouvier, William D. Ristenpart. Effect of voicing and articulation manner on aerosol particle emission during human speech. PLOS ONE, 2020; 15 (1): e0227699 DOI: 10.1371/journal.pone.0227699X
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