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Are Face Masks Effective? The Evidence


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2021 Jan 30, 5:13pm   4,346 views  210 comments

by Patrick   ➕follow (58)   💰tip   ignore  

https://swprs.org/covid-masks-review/

There is increasing evidence that the novel coronavirus is transmitted, at least in indoor settings, not only by droplets but also by smaller aerosols. However, due to their large pore size and poor fit, cloth masks cannot filter out aerosols (see video analysis below): over 90% of aerosols penetrate or bypass the mask and fill a medium-sized room within minutes.
The WHO admitted to the BBC that its June 2020 mask policy update was due not to new evidence but “political lobbying”: “We had been told by various sources WHO committee reviewing the evidence had not backed masks but they recommended them due to political lobbying. This point was put to WHO who did not deny.” (D. Cohen, BBC Medical Corresponent).
To date, the only randomized controlled trial (RCT) on face masks against SARS-CoV-2 infection in a community setting found no statistically significant benefit (see above). However, three major journals refused to publish this study, delaying its publication by several months.
An analysis by the US CDC found that 85% of people infected with the new coronavirus reported wearing a mask “always” (70.6%) or “often” (14.4%). Compared to the control group of uninfected people, always wearing a mask did not reduce the risk of infection.
Researchers from the University of Minnesota found that the infectious dose of SARS-CoV-2 is just 300 virions (viral particles), whereas a single minute of normal speaking may generate more than 750,000 virions, making cloth face masks unlikely to prevent an infection.
Japan, despite its widespread use of face masks, experienced its most recent influenza epidemic with more than 5 million people falling ill just one year ago, in January and February 2019. However, unlike SARS-CoV-2, the influenza virus is easily transmitted by children, too.
Austrian scientists found that the introduction, retraction and re-introduction of a face mask mandate in Austria had no influence on the coronavirus infection rate.
In the US state of Kansas, the 90 counties without mask mandates had lower coronavirus infection rates than the 15 counties with mask mandates. To hide this fact, the Kansas health department tried to manipulate the official statistics and data presentation.
Contrary to common belief, studies in hospitals found that the wearing of a medical mask by surgeons during operations didn’t reduce post-operative bacterial wound infections in patients.
During the notorious 1918 influenza pandemic, the use of cloth face masks among the general population was widespread and in some places mandatory, but they made no difference.
Asian countries with low covid infection rates, most of them neighboring China, benefited not from face masks but mainly from early border closures. This is confirmed by Scandinavian countries Norway, Finland and Denmark, which didn’t introduce mask mandates but closed borders early and saw very low covid infection and death rates, too.
German scientists found that in and on N95 (FFP2) masks, the novel coronavirus remains infectious for several days, much longer than on most other materials, thus significantly increasing the risk of infection by touching or reusing such masks.

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206   Onvacation   2021 Aug 13, 4:03pm  

Risks associated with face masks
Wearing masks for a prolonged period of time may not be harmless, as the following evidence shows:

1)The WHO warns of various “side effects” such as difficulty breathing and skin rashes.

2)Tests conducted by the University Hospital of Leipzig in Germany have shown that face masks significantly reduce the resilience and performance of healthy adults.

3)A German psychological study with about 1000 participants found “severe psychosocial consequences” due to the introduction of mandatory face masks in Germany.

4)The Hamburg Environmental Institute warned of the inhalation of chlorine compounds in polyester masks as well as problems in connection with face mask disposal.

5)The European rapid alert system RAPEX has already recalled 70 mask models because they did not meet EU quality standards and could lead to “serious risks”.

6)A study by the University of Muenster in Germany found that on N95 (FFP2) masks, Sars-CoV-2 may remain infectious for several days, thus increasing the risk of self-contamination.

7)In China, several children who had to wear a mask during gym classes fainted and died; the autopsies found a sudden cardiac arrest as the probable cause of death. In the US, a car driver wearing an N95 (FFP2) mask fainted and crashed due to CO2 intoxication.
https://swprs.org/face-masks-evidence/#aerosols
207   Onvacation   2021 Aug 13, 4:07pm  

Conclusion
Face masks in the general population might be effective, at least in some circumstances, but there is currently little to no evidence supporting this proposition. If the coronavirus is indeed transmitted via indoor aerosols, face masks are unlikely to be protective. Health authorities should therefore not assume or suggest that face masks will reduce the rate or risk of infection.
208   Karloff   2021 Aug 15, 5:37pm  

https://www.zerohedge.com/covid-19/do-masks-work-review-evidence

In sum, of the 14 RCTs that have tested the effectiveness of masks in preventing the transmission of respiratory viruses, three suggest, but do not provide any statistically significant evidence in intention-to-treat analysis, that masks might be useful. The other eleven suggest that masks are either useless - whether compared with no masks or because they appear not to add to good hand hygiene alone—or actually counterproductive. Of the three studies that provided statistically significant evidence in intention-to-treat analysis that was not contradicted within the same study, one found that the combination of surgical masks and hand hygiene was less effective than hand hygiene alone, one found that the combination of surgical masks and hand hygiene was less effective than nothing, and one found that cloth masks were less effective than surgical masks.
210   Eric Holder   2021 Aug 18, 10:21am  

Onvacation says
RAPEX


Nice name.

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