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Originally Posted by G13
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There has never been a randomized clinical trial I'm aware of that proves masks prevent Covid transmission. Maybe Ennewi can find one.
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There have been several clinical trials over the years which studied how effective masks were in preventing other illnesses such as the common cold
They all concluded masks did nothing to prevent the spread. A total waste of time.
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https://pubmed.ncbi.nlm.nih.gov/23413265/
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2013 May 1
Rationale: We compared three policy options for the use of medical masks and N95 respirators in healthcare workers (HCWs).
Objectives: A cluster randomized clinical trial of 1,669 hospital-based HCWs in Beijing, China in the winter of 2009-2010.
Methods: Participants were randomized to medical masks, N95 respirators, or targeted use of N95 respirators while doing high-risk procedures or barrier nursing. Outcomes included clinical respiratory illness (CRI) and laboratory-confirmed respiratory pathogens in symptomatic subjects.
Measurements and main results: The rate of CRI was highest in the medical mask arm (98 of 572; 17%), followed by the targeted N95 arm (61 of 516; 11.8%), and the N95 arm (42 of 581; 7.2%) (P < 0.05). Bacterial respiratory tract colonization in subjects with CRI was highest in the medical mask arm (14.7%; 84 of 572), followed by the targeted N95 arm (10.1%; 52 of 516), and lowest in the N95 arm (6.2%; 36 of 581) (P = 0.02). After adjusting for confounders, only continuous use of N95 remained significant against CRI and bacterial colonization, and for just CRI compared with targeted N95 use. Targeted N95 use was not superior to medical masks.
Conclusions: Continuous use of N95 respirators was more efficacious against CRI than intermittent use of N95 or medical masks. Most policies for HCWs recommend use of medical masks alone or targeted N95 respirator use. Continuous use of N95s resulted in significantly lower rates of bacterial colonization, a novel finding that points to more research on the clinical significance of bacterial infection in symptomatic HCWs. This study provides further data to inform occupational policy options for HCWs. Clinical trial registered with Australian New Zealand Clinical Trials Registry http://www.anzctr.org.au (ACTRN 12609000778280).
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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4941587
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(i) Clinical respiratory illness (CRI), 19 defined as two or more respiratory or one respiratory symptom and a systemic symptom; (ii) ILI, defined as fever ≥38°C plus one respiratory symptom (i.e. cough, runny nose, etc.); (iii) laboratory‐confirmed viral respiratory infection (detection of adenoviruses, human metapneumovirus, coronavirus 229E/NL63, parainfluenza viruses 1, 2 and 3, influenza viruses A and B, respiratory syncytial virus A and B, rhinovirus A/B and coronavirus OC43/HKU1 by multiplex PCR); (iv) laboratory‐confirmed influenza A or B and (v) adherence with mask/respirator use.
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A bit tired to do a more thorough search, but that seems close enough.
Quote:
Originally Posted by G13
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But what do any of those scientists know? They aren't a writer for Dr. Who like Matthew Sweet
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Those scientists have any names?
As for this Matthew fellow, you cherry picked his credentials of course, leaving out English journalist, broadcaster, cultural historian, and graduate of the University of Oxford. Granted, it's not warder loot but still, overlooking those other achievements seems wrong.
Quote:
Originally Posted by G13
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You included a 19 second video to show how mindless someone was, with the link set to the 18 second mark. An observation that speaks for itself?
04-18-2021, 05:51 AM
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