Most people, including teachers and teachers' unions, haven't understood 2 things yet:
"Aerosol" = air contaminated for *HOURS*.
Covid transmission is virtually 100% via "aerosol", and not via droplets and surfaces.
On April 5 the US GOV Center for Disease Control 👇 1/3
"Aerosol" = air contaminated for *HOURS*.
Covid transmission is virtually 100% via "aerosol", and not via droplets and surfaces.
On April 5 the US GOV Center for Disease Control 👇 1/3
published surprising new findings: infections have been almost zero by contaminated surfaces, and virtually all by contaminated air.
Quote & link:
"the risk of SARS-CoV-2 infection via the fomite transmission route is low, and generally less than 1 in 10,000, which 2/3 👇
Quote & link:
"the risk of SARS-CoV-2 infection via the fomite transmission route is low, and generally less than 1 in 10,000, which 2/3 👇
means that each contact with a contaminated surface has less than a 1 in 10,000 chance of causing an infection"
What that means for classrooms is that
☀️VERY GOOD VENTILATION☀️
is the best way to minimise transmission of Covid-19!
VENTILATE CLASSROOMS
cdc.gov/coronavirus/20…
What that means for classrooms is that
☀️VERY GOOD VENTILATION☀️
is the best way to minimise transmission of Covid-19!
VENTILATE CLASSROOMS
cdc.gov/coronavirus/20…
PS: In other words, if this CDC paper is correct only ventilation and very good masks (N95, FFP2 FFP3) effectively reduces transmission, whilst bad masks and surfaces wiping are a dangerous and misdirected waste of time and energy.
Quote:
"risk of SARS-CoV-2 infection 👇
Quote:
"risk of SARS-CoV-2 infection 👇
via the fomite (surfaces) transmission route is low, and generally less than 1 in 10,000, which means that each contact WITH A CONTAMINATED SURFACE (!) has less than a 1 in 10,000 chance of causing an infection"
So: ventilation, ventilation, ventilation!
cdc.gov/coronavirus/20…
So: ventilation, ventilation, ventilation!
cdc.gov/coronavirus/20…
Pointing out that on my opening tweet I wrote that most people haven't understood 2 things:
1. Aerosol
2. virtually 100%
Many people, and probably most teachers, knew about aerosol, but not that it was responsible for virtually 100% of cases.
CDC's 1/10,000 was surprising.
1. Aerosol
2. virtually 100%
Many people, and probably most teachers, knew about aerosol, but not that it was responsible for virtually 100% of cases.
CDC's 1/10,000 was surprising.
EXCELLENT Japanese gov. public advice re. ventilation 👇
2 minutes video 👇
2 minutes video 👇
https://twitter.com/DrEricDing/status/1315423124301795330?s=19
Dr. @AlisonGeorge10 has tweeted me this very helpful chart 👇 
.@YololoYolo tweeted me:
"For a school our size (1000) (...) £40-50k to make all classrooms as virus safe as possible."
= ONLY £50/child !
x £11.7 million school children
= £600 million
That👆is =
0.5% of the NHS budget
1.7 % of Dido Harding's £36 *BILLION" track & trace
"For a school our size (1000) (...) £40-50k to make all classrooms as virus safe as possible."
= ONLY £50/child !
x £11.7 million school children
= £600 million
That👆is =
0.5% of the NHS budget
1.7 % of Dido Harding's £36 *BILLION" track & trace
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