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Anonymous ID: ec5685 July 13, 2020, 7:22 p.m. No.9953896   ๐Ÿ—„๏ธ.is ๐Ÿ”—kun

June 1, 2020

Mask Facts

 

curated by Marilyn M. Singleton, M.D., J.D.

 

Transmission of SARS-CoV-2

 

Note: A COVID-19 (SARS-CoV-2) particle is 0.125 micrometers (ฮผm); influenza virus size is 0.08 โ€“ 0.12 ฮผm; a human hair is about 150 ฮผm.

 

*1 nm = 0.001 micron; 1000 nm = 1 micron; Micrometer (ฮผm) is the preferred name for micron (an older term)

 

1 meter is = 1,000,000,000 nm or 1,000,000 microns

 

Droplets

 

Virus is transmitted through respiratory droplets produced when an infected person coughs, sneezes or talks. Larger respiratory droplets (>5 ฮผm) remain in the air for only a short time and travel only short distances, generally <1 meter. They fall to the ground quickly. https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30245-9/fulltext

This idea guides the CDCโ€™s advice to maintain at least a 6-foot distance.

Virus-laden small (<5 ฮผm) aerosolized droplets can remain in the air for at least 3 hours and travel long distances. https://www.nejm.org/doi/pdf/10.1056/NEJMc2004973?articleTools=true

 

Air currents

 

In air conditioned environment these large droplets may travel farther.

However, ventilation โ€” even the opening of an entrance door and a small window can dilute the number of small droplets to one half after 30 seconds. (This study looked at droplets from uninfected persons). This is clinically relevant because poorly ventilated and populated spaces, like public transport and nursing homes, have high SARS-CoV-2 disease transmission despite physical distancing. https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30245-9/fulltext

 

Objects and surfaces

 

Person to person touching

The CDCโ€™s most recent statement regarding contracting COVID-19 from touching surfaces: โ€œBased on data from lab studies on Covid-19 and what we know about similar respiratory diseases, it may be possible that a person can get Covid-19 by touching a surface or object that has the virus on it and then touching their own mouth, nose or possibly their eyes,โ€ the agency wrote. โ€œBut this isnโ€™t thought to be the main way the virus spreads. https://www.cdc.gov/media/releases/2020/s0522-cdc-updates-covid-transmission.html.

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https://aapsonline.org/mask-facts/

 

Has this been Noted?