Masks don't work well. Prove me wrong.​
VARIOUS FACE MASK STUDIES PROVE THEIR (Masks) INEFFECTIVENESS​
1. Surgical mask / cloth face mask studies​
Community and Close Contact Exposures Associated with COVID-19 Among Symptomatic Adults ≥18 Years in 11 Outpatient Health Care Facilities — United States, July 2020
The US Centre for Disease Control performed a study which showed that 85 percent of those who contracted Covid-19 during July 2020 were mask wearers. Just 3.9 percent of the study participants never wore a mask.
Original:
https://www.cdc.gov/mmwr/volumes/69/wr/pdfs/mm6936a5-H.pdf
Erratum. correction:
Erratum: Vol. 69, No. 36 Horowitz: CDC study: 85% of COVID-19 cases in July were people who often or always wear masks
2. Facial protection for healthcare workers during pandemics: a scoping review​
This study used 5462 peer-reviewed articles and 41 grey literature records.
“Conclusion: The COVID-19 pandemic has led to critical shortages of medical-grade PPE. Alternative forms of facial protection offer inferior protection. More robust evidence is required on different types of medical-grade facial protection. As research on COVID-19 advances, investigators should continue to examine the impact on alternatives of medical-grade facial protection”
So how is your cloth and surgical mask working again if EVEN medical grade alternatives are failing ?
Study Article:
Facial protection for healthcare workers during pandemics: a scoping review - PubMed
3. Physical interventions to interrupt or reduce the spread of respiratory viruses​
“There is moderate certainty evidence that wearing a mask probably makes little or no difference to the outcome of laboratory-confirmed influenza compared to not wearing a mask”
Study article:
Physical interventions to interrupt or reduce the spread of respiratory viruses - PubMed
4. Disposable surgical face masks for preventing surgical wound infection in clean surgery​
“We included three trials, involving a total of 2106 participants. There was no statistically significant difference in infection rates between the masked and unmasked group in any of the trials”
Study article:
Disposable surgical face masks for preventing surgical wound infection in clean surgery - PubMed
5. Disposable surgical face masks: a systematic review​
Two randomized controlled trials were included involving a total of 1453 patients. In a small trial there was a trend towards masks being associated with fewer infections, whereas in a large trial there was no difference in infection rates between the masked and unmasked group.
Study article:
Disposable surgical face masks: a systematic review - PubMed
6. Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure​
“Our results suggest that cloth masks are only marginally beneficial in protecting individuals from particles<2.5 μm”
Study article:
Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure - PubMed
7. Face seal leakage of half masks and surgical masks​
“The filtration efficiency of the filter materials was good, over 95%, for particles above 5 micron in diameter but great variation existed for smaller particles.
Coronavirus is 0.125 microns. therefore these masks wouldn’t protect you from the virus”
Study article:
Face seal leakage of half masks and surgical masks - PubMed
8. Comparison of the Filter Efficiency of Medical Nonwoven Fabrics against Three Different Microbe Aerosols​
“The filter efficiencies against influenza virus particles were the lowest”
“We conclude that the filter efficiency test using the phi-X174 phage aerosol may overestimate the protective performance of nonwoven fabrics with filter structure compared to that against real pathogens such as the influenza virus”
Study article:
Comparison of the Filter Efficiency of Medical Nonwoven Fabrics against Three Different Microbe Aerosols - PubMed
9. Aerosol penetration through surgical masks​
“Although surgical mask media may be adequate to remove bacteria exhaled or expelled by health care workers, they may not be sufficient to remove the submicrometer-size aerosols containing pathogens ”
Study article:
Aerosol penetration through surgical masks - PubMed
10. Particle removal from air by face masks made from Sterilization Wraps: Effectiveness and Reusability​
“We found that 60 GSM face mask had particle capture efficiency of 94% for total particles greater than 0.3 microns”
How big is the virus again? 0.125 microns.
Study article:
Particle removal from air by face masks made from Sterilization Wraps: Effectiveness and Reusability - PubMed
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