Seule étude sur la protection des masques est effondré

par Light Seeker, jeudi 06 janvier 2022, 20:19 (il y a 1576 jours) @ cornel

"On va attendre longtemps! oui,oui
le masque a prouvé son efficacité
au bout de 2 ans ,de 5 vagues,de 4 doses génétiques"

Quoi, tu admets qu'il y a une pandémie ? LOL
Personne a dit que le masque suffisait. Ca contribue à aider. Malhonnêteté intellectuelle crasse!

"un million de nanomètre, passe dans 1 millimètre"

Tu fais exprès de jouer aux ignorants ou tu l'es vraiment? Cette histoire stupide remonte aux tout début de la pandémie :

Extrait : "Or la taille des particules virales n’est pas pertinente. C’est la taille des gouttelettes qui contiennent le virus qui importe, soulignait début juillet Julian Leibowitz, professeur en pathogénie microbienne et immunologie à la Texas A & M University.

Mais d’après les dernières études, le virus se déplace, et se transmet, principalement sur des gouttelettes plus grosses entre 5 et 15 microns de diamètres. Pour rappel, un micron mesure 1 000 nanomètres. Donc si l’on prend une taille du virus autour de 100 nanomètres, soit 0,1 micron, le virus circule sur des gouttelettes 50 à 150 fois plus grosses que lui.

« Les mailles de votre masque mesurent + /- 3 000 nanomètres. » Tout d’abord, prenons la même unité de mesure. Les mailles mesurent 3 000 nanomètres, soit 3 microns. C’est déjà trop fin pour laisser passer les gouttelettes porteuses du virus comme le confirme l’Institut national de recherche et de sécurité (INRS). Les trois types de masques chirurgicaux (Type I, Type II et Type IIR) filtrent entre 95 et 98 % des aérosols, les fameuses gouttelettes, à partir d’une taille de 3 microns."

Leur utilité est prouvée depuis belle lurette. Ne confond pas ton incapacité à comprendre avec un réel manque d'utilité des masques LOL

https://med.stanford.edu/news/all-news/2021/09/surgical-masks-covid-19.html

https://www.livescience.com/randomized-trial-shows-surgical-masks-work-curbing-covid.html

Human Studies of Masking and SARS-CoV-2 Transmission
A large, well-designed cluster-randomized trial in Bangladesh in late 2020 found that surgical or cloth mask distribution, role-modeling, and active mask promotion tripled mask use to 42.3% in intervention villages compared to 13.3% in comparison villages. In villages receiving mask interventions, symptomatic seroprevalence of SARS-CoV-2 was reduced by approximately 9% relative to comparison villages. In villages randomized to receive surgical masks, symptomatic seroprevalence of SARS-CoV-2 was significantly lower (relative reduction 11.1% overall). The results of this study show that even modest increases in community use of masks can effectively reduce symptomatic SARS-CoV-2 infections (COVID-19).37

A study of an outbreak aboard the USS Theodore Roosevelt, an environment notable for congregate living quarters and close working environments, found that use of face coverings on-board was associated with a 70% reduced risk of infection.38
In a study of 124 Beijing households with > 1 laboratory-confirmed case of SARS-CoV-2 infection, mask use by the index patient and family contacts before the index patient developed symptoms reduced secondary transmission within the households by 79%.39

A study examining SARS-CoV-2 secondary attack rates among eight public K-12 school districts in Massachusetts (70 schools with >33,000 enrolled students) during the 2020–21 school year found an unadjusted secondary attack rate of 11.7% for unmasked versus 1.7% for masked interactions.40

A retrospective case-control study from Thailand documented that, among more than 1,000 persons interviewed as part of contact tracing investigations, those who reported having always worn a mask during high-risk exposures experienced a greater than 70% reduced risk of acquiring infection compared with persons who did not wear masks under these circumstances.41

During July 15–August 31, 2021, when Delta was the predominant strain circulating in the U.S., about one in five K–12 public non-charter schools open for in-person learning in Maricopa and Pima Counties, Arizona, experienced a school-associated outbreak. Outbreaks were three and a half times more likely (adjusted odds ratio 3.5, 95% confidence interval 1.8-6.6) in schools without mask mandates.42

In a nationwide analysis of data collected during July 1-September 4, 2021, U.S. counties without school mask requirements experienced larger increases in pediatric COVID-19 case rates (18.53 per 100,000 per day more cases) after the start of school compared with counties with school mask requirements.43
An investigation of a high-exposure event in the U.S., in which 2 symptomatically ill hair stylists interacted for an average of 15 minutes with each of 139 clients during an 8-day period, found that none of the 67 clients who subsequently consented to an interview and testing developed infection. The stylists and all clients universally wore masks in the salon as required by local ordinance and company policy at the time.44

Investigations involving infected passengers aboard flights longer than 10 hours strongly suggest that masking prevented in-flight transmissions, as demonstrated by the absence of infection developing in other passengers and crew in the 14 days following exposure.45, 46

At least ten studies have confirmed the benefit of universal masking in community level analyses: in a unified hospital system,47 a German city,48 two U.S. states,49, 50 a panel of 15 U.S. states and Washington, D.C.,51, 52 as well as both Canada53 and the U.S.54-56 nationally. Each analysis demonstrated that, following directives from organizational and political leadership for universal masking, new infections fell significantly. Two of these studies51, 52 and an additional analysis of data from 200 countries that included the U.S.56 also demonstrated reductions in mortality. Another 10-site study showed reductions in hospitalization growth rates following mask mandate implementation.54 A separate series of cross-sectional surveys in the U.S. suggested that a 10% increase in self-reported mask wearing tripled the likelihood of stopping community transmission.57 An economic analysis using U.S. data found that, given these effects, increasing universal masking by 15% could prevent the need for lockdowns and reduce associated losses of up to $1 trillion or about 5% of gross domestic product.52

En passant, tu es sur terre, nous sommes en 2022, et ceci n'est pas un forum sur la cuisine française.