[Thread] So why does ventilation matter so much in #Covid19 suppression?

Covid-19 is a disease caught by inhaling virus particles in the air 1/
the closer you are to an infected person & the longer you spend, the higher the risk of inhaling infected air

Shouting, singing & exercising make it worse

[there’s very low risk of catching it from surfaces, early research was over-stated & hasn’t been repeated in labs] 2/
outdoors the virus is diluted & dispersed in the air, so the risks are very low (except up close conversation)

If we all lived outdoors there would be no pandemic, as the virus couldn’t reproduce enough, & would die out 3/
the problem is buildings, we only have pandemic because certain indoor conditions allow virus to reproduce A LOT

high-risk conditions are closed spaces where virus builds up like cigarette smoke & can’t disperse
*worse in low humidity
*worse without masks
*worse in crowds 4/
ventilation in buildings isn’t accidental.. it’s designed & measurable

in Northern Europe temperate climates most are ventilated ‘naturally’ with windows & wall vents

some are ‘mechanically’ ventilated with ducts & fans

& some air-conditioned, to cool air & remove moisture
most buildings are low risk

some are higher risk in cold seasons ..& can be safer with lower occupancy ..&/or more ventilation/ filtration/ humidity ..& shorter times

some are very high-risk ..& need very low occupancy & re-engineering

but... it’s all measurable & fixable 6/
so, a pandemic can be suppressed by making ‘indoor air’ as clean as ‘outdoor air’

high-risk places are family homes, cars, nursing homes, overcrowded housing, schools, meat plants, pubs, restaurants, gyms, public transport

or anywhere there’s close contact in closed spaces 7/
air ventilation & filtration
*can start immediately
*is low cost/free & very low tech
*doesn’t need a vaccine
*suppresses all airborne disease incl flu, TB, Covid19, mink mutations & future pandemics
*is healthier for everyone
* is all scientifically evidenced & measurable 8/
*all of this thread is evidenced by current international Covid19 research & evidence

Public health advice hasn’t kept pace, or engaged with the environmental sciences
@threadreaderapp please unroll

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Orla Hegarty

Orla Hegarty Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @Orla_Hegarty

23 Nov
Science denial from @VFIpubs on @morningireland
.. 2 metre distance is not safe, #Covid19 builds up quickly & spreads like cigarette smoke indoors, pubs & restaurants are the highest risk of large super-spread events, & it’s proven internationally #pubs
(does this really need saying)
Covid doesn’t know if it’s a gastro pub or wet pub, or after closing time, or what the Level is, or what your dinner cost, or if you ate it, or if you’re 6km away, or only went in for 10 minutes

You catch it by inhaling virus in shared indoor air
HIQA advice to NPHET:
🦠 large numbers of clusters consistently observed [in] bars, nightclubs, restaurants, gyms
🦠 & many associated with superspreading events & large numbers of cases
🦠indoors, crowds, no masks, talking/singing, poor ventilation
hiqa.ie/reports-and-pu…
Read 5 tweets
21 Nov
International science:
‘Restaurants & pubs are highest risk for indoor super-spread, as virus builds up quickly in air & nobody wears masks’

Ireland:
‘Restaurants & pubs to be ‘key battleground’ in lockdown exit talks’

Is #Covid19 in these talks?
irishtimes.com/news/politics/…
Cork: ‘57 confirmed cases of Covid-19 were linked to a cáfe-restaurant where people from different households socialised’ #superspread
echolive.ie/corknews/Covid…
South Korea: ‘one infected person attended five nightclubs, caused 50+ new infections’

Hong Kong: ‘106 cases linked back to exposures from staff & musicians at bars.. 73 of the people in this cluster caught virus at the bars, 39 were customers vox.com/21296067/coron…
Read 15 tweets
3 Nov
[Thread] Nursing Homes

‘103 #Covid19 deaths in October, 39 of them in nursing homes’

.. almost 40% of all recent deaths from #Covid19, & almost 1/2 of all deaths in Ireland since start of pandemic, are in #nursinghomes 1/ irishtimes.com/news/health/co…
about 30,000 people live in nursing homes... so just 0.5% of the population have suffered 50% of #Covid19 fatalities

HSE attribute this to ‘high rates of community transmission’, but... 2/ irishtimes.com/news/ireland/i…
..elderly people & people with health conditions who live ~outside~ nursing homes ‘in the community’ do not have these infection rates

... & Dublin #nursinghomes have not allowed visitors for more than 6 weeks now 3/
Read 10 tweets
2 Nov
WHO warns of high risk of #Covid19 spread ‘especially indoors in poor ventilation’ & says ‘open a window’

.. so why no risk prevention advice in Ireland’s public health plan.. nine months after this was warned about in many other countries?
Read 4 tweets
2 Nov
HSE mask policy is ~not~ in accordance with current international scientific evidence, & is unsafe
🦠covid is airborne past 2m
🦠15 mins is not a safe time #TodayCB @TodaywithClaire @HSELive @hpscireland @HIQA
@linseymarr explains distance risks
Read 4 tweets
1 Nov
[Thread] Covid19 & weather

Research from China points to Ireland being very high-risk for virus spread in winter months. This study linked Spring hot-spot outbreaks (yellow zone) at 5-11°C & low humidity 1/ #Covid19 jamanetwork.com/journals/jaman… Image
another study: ‘meteorological factors play independent role in #COVID19 transmission.. Local weather (low temp, mild diurnal temp range & low humidity) likely favor transmission.. each 1°C increase in [temp] related to decline of daily confirmed cases’ 2/ sciencedirect.com/science/articl…
‘Air temperature & humidity indicated to significantly influence transmission of COVID-19’.. the weather two weeks ago was correlated with confirmed new case counts.. epidemiological data were correlated with weather data 14 days ago’ 3/ medrxiv.org/content/10.110…
Read 7 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!

Follow Us on Twitter!