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Orla Hegarty Profile picture
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6 Jan, 9 tweets, 3 min read
[Thread] Understanding the science of HOW #Covid19 spreads is the key to breaking the chain & stopping new infections

Here’s the work of world leading scientists

Dr Don Milton, Professor of Applied Environmental Health, University of Maryland 1/
Professor of Chemistry Jose-Luis Jiminez of University of Colorado @jljcolorado 2/
Professor of Atmospheric Chemistry Kimberly Prather of University of California San Diego 3/
Professor of Chemistry Alex Huffman of University of Denver @HuffmanLabDU 4/
Professor of Mechanical Engineering Shelly Miller of University of Colorado 5/
Professor of Public Health Joseph Allen of Harvard University 6/
Professor of Civil & Environmental Engineering Linsey Marr of Virginia Tech 7/
*more to follow
Professor of Primary Care Trisha Greenhalgh of University of Oxford @trishgreenhalgh

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More from @Orla_Hegarty

Orla Hegarty Profile picture
9 Jan
Outbreaks in food processing is due to building operation for energy efficiency/cost saving by recirculating cold, dry air

In a German meat plant transmission was recorded at 8m.. so they fixed the ventilation

High risk indoor conditions are ~all~ preventable @SamuelMcConkey1
‘Cold and stale air conditions allowed coronavirus particles to travel more than 8 meters (26 feet) at a German slaughterhouse, a study showed, giving an insight into how meat plants turned into hotspots for infections across the world’
bloomberg.com/news/articles/…
2/3 of ~all~ workplace outbreak cases in Ireland have been in meat/poultry/fish processing plants (that’s fewer than 150 buildings)

6 outbreaks are currently open, range 3 to 72 cases in open outbreaks

In a Cork meat plant outbreak ~226~ were infected
hpsc.ie/a-z/respirator…
Read 4 tweets
Orla Hegarty Profile picture
7 Jan
Japan adopted “3 Cs” of #Covid19 prevention in February 2020

🦠 Avoid CLOSE contact situations, keep distance
🦠Avoid CROWDS, risks are higher
🦠Avoid CLOSED, poorly ventilated space, virus spreads like smoke indoors
😷 Wear MASKS

Science-based rules work Image
Japan (population 126 million) is now trying to control the ~latest wave~ of coronavirus, with cases running at record levels of 3,000 to 4,000 a day, of which about 1,000 are in Tokyo’

Ireland (pop 5 million) is currently close to 10,000 new cases a day irishtimes.com/news/world/asi…
Japan is in similar high risk environmental zone as Ireland (30-50° latitude, winter conditions 5-11°C with low absolute humidity) Image
Read 4 tweets
Orla Hegarty Profile picture
7 Jan
So Ireland INCREASED coal burning in the middle of an ENVIRONMENTAL pandemic where air pollution makes both virus spread & respiratory illness WORSE.. because ‘two electricity lines exported electricity to Britain, where prices were higher’ #COVID19ireland
irishtimes.com/business/energ…
Moneypoint, Ireland’s largest electricity generating station, is coal burning & the countries largest emitter of greenhouse gases @ESBNetworks @EPAAirQuality

Moneypoint location & air quality on @BreezoMeter this morning (prevailing winds from south west) Image
Environmental conditions are really bad for #Covid19 spread this week- very low temperatures, low absolute humidity, light winds, high environmental pollution

This will not give #lockdown drop in cases of April/May

@BreezoMeter last night, many homes burning solid fuel in 0°C Image
Read 4 tweets
Orla Hegarty Profile picture
29 Nov 20
Lots of interest in #Covid19 #ventilation (finally!) so he’s a round up of threads to stop the virus spread
(many threads are webpages here: threadreaderapp.com/user/Orla_Hega… ) 1/
#Covid19 is inhaled, avoid it by breathing clean air 2/
#Covid19 spread can be easily reduced by manipulating indoor air conditions 3/
Read 14 tweets
Orla Hegarty Profile picture
28 Nov 20
[Thread] #Restaurants

↔️ spaced tables do not protect from airborne spread over 2m

🍽 eating & talking indoors without masks is high risk of super-spread

🪟🌬building reg ventilation standards aren’t enough to stop virus build up

🦠visors don’t protect staff 1/ #Covid19
..
📈🌬 wall & ceiling-mounted ‘air con’ units can make it worse, by blowing virus around 2/

Super-spread in restaurant in China @businessinsider businessinsider.com/how-restaurant…
🚻 in poorly ventilated toilets, lobbies, staff areas, kitchens, storage & cold rooms, virus can linger in air for hours

🧼 🙌 transmission from surfaces is low, clean air is more important than clean hands

🌬Perspex screens don’t stop airborne virus, & can trap stale air 3/
Read 6 tweets
Orla Hegarty Profile picture
23 Nov 20
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

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