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Amount of SARS-2 exposure may determine whether or not you develop symptoms: On Diamond Princess people didn't wear masks & only 18% of infected were asymptomatic (bit.ly/2CEoTOX) but on another ship where everyone was masked, the number was 81%
thorax.bmj.com/content/75/8/6…
Many other examples too, like Oregon plant where everyone was masked and of 120 infections, 95% developed asymptomatic disease

By reducing viral exposure/load, masks could help reduce disease severity.

TY Dr. @MonicaGandhi9 @UCSF for elucidating this

kval.com/news/local/ove…
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Dr. Ali Nouri
@AliNouriPhD
GOOD NEWS: farUVC light, which doesn't hurt us, kills coronaviruses (and therefore probably SARS-2). Could reduce indoor transmission.

Top image: virus (green) infects cultured cells
Bottom: when virus is exposed to farUVC, ability to infect the blue cells goes way down..1/2 Infection of human lung cells from irradiated aerosolized al
...Since SARS-2 can linger in air/remain infectious, low-dose far-UVC lamps could effectively kill it, indoors

This tool augments physical distance, masks, & ventilation to potentially reduce transmission of coronaviruses AND influenza!

nature.com/articles/s4159…
While conventional UVC light sources are harmful, far-UVC can't penetrate even the outer layers of human skin or eye. So continuous very low dose-rate far-UVC in indoor locations is a promising and safe tool to reduce airborne-mediated disease:

nature.com/articles/s4159…
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Dr. Ali Nouri
@AliNouriPhD
Letter from 239 scientists: "Time to Address Airborne Transmission of COVID-19"

Bottomline: Time to guard against inhalation of microdroplets -- small droplets that don't fall to the ground within 6ft but travel longer distances and remain suspended in air.
We know viruses are released during exhalation, talking, and coughing in microdroplets.

Studies of SARS-CoV-1 points to airborne route; every reason to expect that SARS-CoV-2 behaves similarly.

Avoid overcrowding and provide ventilation!

Letter: bit.ly/31R7VHE
Here's the letter:

academic.oup.com/cid/article/do…
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