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Orla Hegarty Profile picture
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28 Mar, 3 tweets, 2 min read
😷 #Covid19 Face-masks protect children, the science is irrefutable..& it’s a success elsewhere, now & in the past
*ventilation in schools is critically important, but you can’t ventilate your way out of short-range risk (<2m), the ~only~ protection up close is a well fitting mask
dress warm, open windows, move outside, stay safe

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More from @Orla_Hegarty

Orla Hegarty Profile picture
28 Mar
Ventilation in schools, 1850:
‘Let is suppose the case of a schoolroom containing 10,000 cubic feet (50 x 20 x 10’)* of perfectly pure air with 200 pupils. To each of them will be allowed 10 cubic feet of air per minute...’. 1/
*283m3 (15 x 6 x 3m)
‘..there would be 50 [cubic] feet for each pupil & air of the room would be rendered unfit for respiration by carbonic acid [CO2] alone in ~just 5 minutes~.. at the end of 5 minutes pupils begin to inhale again & again the excrementitious matter from their own & others bodies’ 2/
‘..at end of one hour, 84 ounces (2.4kg) of this poison would be held in solution in the air..& be constantly going the round of the circulation, sowing the seeds of death’ ‘the oxygen would be entirely exhausted in 14 or 15 hours.. many pupils would not be living long before’ 3/
Read 10 tweets
Orla Hegarty Profile picture
27 Mar
#Covid19 made us more aware of dangers.. an outbreak of SARs virus in Hong Kong in 2003 was traced to #apartments plumbing & ventilation, leading to warnings from the World Health Organisation about shortcuts in design, construction & maintenance’ 1/ independent.ie/business/perso…
‘SARS virus was spread primarily through the air. High concentrations of viral aerosols in building plumbing were drawn into #apartment bathrooms through floor drains.. virus-laden air was transported by prevailing winds to adjacent buildings’ 2/ pubmed.ncbi.nlm.nih.gov/16696450/
‘infected cases found along 2 vertical lines of #apartment building & each line was connected through a single ventilation air duct in the bathroom.. investigation found no other possible contact between cases than airborne infection through air duct’ 3/ ijidonline.com/article/S1201-…
Read 9 tweets
Orla Hegarty Profile picture
20 Mar
[Thread] Chicago didn’t have a second wave of Spanish Flu.. so what did they do, & how did the city re-open when there was no vaccine? #Ventilation #COVID19 1/
..here are the public health measures that Chicago took on the autumn of 2018
‘open window ventilation in all school rooms.. pupils warmly dressed.. daily check on pupils & absentees in schools.. use of masks.. landlords required to heat homes.. ’ 2/ documentcloud.adobe.com/link/track?uri…
..’isolation & quarantine.. home nursing provided (see my thread on home nursing).. churches required to improve ventilation.. 150 city health officers on full time service’ 3/
Read 17 tweets
Orla Hegarty Profile picture
20 Mar
‘2m distancing & Perspex screens’ do not protect from airborne #Covid19 indoors

No one should be asked to remove a mask in an enclosed space or to travel unnecessarily.. technology is available for safe oral exams #LeavingCert2021 irishtimes.com/news/education…
*I have arranged &/or attended 100+ remote oral exams in the last year
Link to SEC exam guidance examinations.ie/misc-doc/BI-SC… Image
Read 4 tweets
Orla Hegarty Profile picture
18 Mar
Warning from USA #schools #Covid19 -investment made in unproven technologies that may worsen air quality
More here
& here
Read 4 tweets
Orla Hegarty Profile picture
17 Mar
[Thread] #COVID19
Break the Chain at the
Weakest Link
~Open the Windows~

What can we learn about ventilation & disease control from 1920 nursing manual? 1/ Image
‘a patient in a dark, poorly ventilated room has a harder battle to fight...sunshine & fresh air are nature’s best remedies... the model sick room is a light, quiet, airy, easily heated room on south or east side of the house’ 2/ Image
‘a current of fresh air should be ventilating in sick room day & night... if a fresh supply of oxygen is not admitted to the room at frequent intervals, the patient is force to rebreathe impure air.. heat to make possible to have window open a little even in coldest weather’ 3/ ImageImage
Read 7 tweets

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