julien99 a écrit : 19 nov. 2020, 10:05
Voici une étude danoise qui conclut que l’efficacité du port du masque est insignifiante :
The recommendation to wear surgical masks to supplement other public health measures did not reduce the SARS-CoV-2 infection rate among wearers by more than 50% in a community with modest infection rates, some degree of social distancing, and uncommon general mask use. The data were compatible with lesser degrees of self-protection.
https://www.acpjournals.org/doi/10.7326/M20-6817
A cela il faut préciser :
The face masks provided to participants were high-quality surgical masks with a filtration rate of 98%.
De la à contraindre la population à porter des masques à l’extérieur …bon….
Encore une fois une classico julien99 qui donne des sources qui disent le contraire de ce qu'il veut leur faire dire... Je cite une partie de la discussion (j'ai mis en gras)
Les auteurs de l'article a écrit :
Although no statistically significant difference in SARS-CoV-2 incidence was observed, the 95% CIs are compatible with a possible 46% reduction to 23% increase in infection among mask wearers. These findings do offer evidence about the degree of protection mask wearers can anticipate in a setting where others are not wearing masks and where other public health measures, including social distancing, are in effect. The findings, however, should not be used to conclude that a recommendation for everyone to wear masks in the community would not be effective in reducing SARS-CoV-2 infections, because the trial did not test the role of masks in source control of SARS-CoV-2 infection. During the study period, authorities did not recommend face mask use outside hospital settings and mask use was rare in community settings (22). This means that study participants' exposure was overwhelmingly to persons not wearing masks.
L'étude s'intéresse à la probabilité de se protéger du virus en portant un masque pas à la probabilité de protéger les AUTRES en en portant un. Ils ont demandé à des gens de porter un masque dans un environnement où personne n'en porte. Encore faut-il lire plus que l'abstract... Plus loin dans la discussion :
Les auteurs de l'article a écrit :
The potential benefits of a community-wide recommendation to wear masks include combined prevention and source control for symptomatic and asymptomatic persons, improved attention, and reduced potential stigmatization of persons wearing masks to prevent infection of others (17). Although masks may also have served as source control in SARS-CoV-2–infected participants, the study was not designed to determine the effectiveness of source control.
Et encore plus loin:
Les auteurs de l'article a écrit :
Reduction in release of virus from infected persons into the environment may be the mechanism for mitigation of transmission in communities where mask use is common or mandated, as noted in observational studies. Thus, these findings do not provide data on the effectiveness of widespread mask wearing in the community in reducing SARS-CoV-2 infections. They do, however, offer evidence about the degree of protection mask wearers can anticipate in a setting where others are not wearing masks and where other public health measures, including social distancing, are in effect.
Donc dire
julien99 a écrit :
Voici une étude danoise qui conclut que l’efficacité du port du masque est insignifiante :
est parfaitement FAUX. On peut dire en revanche que cette étude conclut que le port du masque ne permet pas de se protéger efficacement de la contamination dans un environnement où peu de gens le portent.