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HVAC professionals: viruses like SARS-2 stay airborne and can travel long distances in rooms & air ducts of ventilation systems. The Assoc. of European HVAC professionals proposes, esp. in ‘hot spots’ to take a set of measures that help to control the airborne route...1/3
...these include increasing fresh air supply and avoiding recirculation of air; increasing exhaust ventilation; staying away from poorly ventilated spaces, among other measures. @REHVAHVAC guidance: bit.ly/39htG4V ...2/3
...US HVAC experts statement:

Transmission of SARS-CoV-2 through the air is sufficiently likely that airborne exposure to the virus should be controlled. Changes to building operations, including the operation of HVAC systems can reduce airborne exposure

Good to see action! 3/3
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Dr. Ali Nouri
@AliNouriPhD
More evidence that low-dose exposure results in asymptomatic disease. Study follows two cohorts of Swiss soldiers. One cohort was infected prior to social distancing when there was lots of mingling. The second cohort got infected after going into social distancing...1/2
...while 30% of the first group developed symptomatic disease, none in social distancing cohort developed symptoms, even though 13 tested positive for SARS-2. Importantly, the asymptomatic cases still had antibodies..2/2

TY for flagging @MonicaGandhi9
academic.oup.com/cid/article/do…
And here's more evidence...
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Dr. Ali Nouri
@AliNouriPhD
Great @arianaeunjung article on role of super-spreaders & airborne spread of SARS-2: 80% of cases may be caused by 10% of people (super-spreaders) e.g. 187 cases linked to single Michigan bar. Ironically, regions least impacted could be at great risk..1/5
washingtonpost.com/health/2020/07…
...because 1 infectious person could set off a chain reaction of infections in large vulnerable pop. Key factor may be airborne spread where virus travels far / lingers in air, particularly indoors. Scientists have warned this could be major culprit...2/5
...e.g. in restaurant in China where virus spread to other tables possibly through AC; or in S. Korea bldng where 95 of the 216 workers on one floor were infected. Bldngs should consider modifying HVAC to bring in more outside air & filter out virus...3/5
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Dr. Ali Nouri
@AliNouriPhD
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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