There was a post I published in August 2020, entitled: Scientific Studies Prove That N95 and Surgical Face Masks Offer NO Protection Against Virus Transmission and Cloth Face Masks Can Increase The Risk of Infection, so some of the study articles that are posted on this blog post may also have been included in that one.
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 participanets never wore a mask.
Original: https://www.cdc.gov/mmwr/volumes/69/wr/pdfs/mm6936a5-H.pdf
Erratum. correction:
https://www.cdc.gov/mmwr/volumes/69/wr/mm6938a7.htm?s_cid=mm6938a7_w
https://www.theblaze.com/op-ed/horowitz-cdc-study-covid-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: https://pubmed.ncbi.nlm.nih.gov/32371574/
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: https://pubmed.ncbi.nlm.nih.gov/33215698/
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: https://pubmed.ncbi.nlm.nih.gov/27115326/
5. Disposable surgical face masks: a systematic review
Two randomised 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: https://pubmed.ncbi.nlm.nih.gov/16295987/
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: https://pubmed.ncbi.nlm.nih.gov/27531371/
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: https://pubmed.ncbi.nlm.nih.gov/4014006/
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: https://pubmed.ncbi.nlm.nih.gov/29910210/
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: https://pubmed.ncbi.nlm.nih.gov/1524265/
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: https://pubmed.ncbi.nlm.nih.gov/33052962/
11. A New Method for Testing Filtration Efficiency of Mask Materials Under Sneeze-like Pressure
This study states that “alternatives” like silk and gauze etc could possibly be good options in the pandemic. It’s done on starch particles. Does not state how big they are either, but they can still get through the material and my research points that starch particles are “big” much bigger than most viruses.
Study article: https://pubmed.ncbi.nlm.nih.gov/32503823/
12. Protecting staff against airborne viral particles: in vivo efficiency of laser masks
“The laser mask provided significantly less protection than the FFP2 respirator (P=0.02), and only marginally more protection than the surgical mask. The continued use of laser masks for respiratory protection is questionable. Taping masks to the face only provided a small improvement in protection”
Study article: https://pubmed.ncbi.nlm.nih.gov/16920222/
13. Quantitative Method for Comparative Assessment of Particle Removal Efficiency of Fabric Masks as Alternatives to Standard Surgical Masks for PPE
“Worn as designed, both commercial surgical masks and cloth masks had widely varying effectiveness (53 – 75 percent and 28 – 91 percent particle removal efficiency, respectively)”. Different brand, different results and only when they applied a “nylon layers” did the “efficiency” improve. Synthetic fibres do not breathe, so this will inevitably effect your breathing.
Study article: https://pubmed.ncbi.nlm.nih.gov/32838296/
14. The efficacy of standard surgical face masks: an investigation using “tracer particles”
“Since the microspheres were not identified on the exterior of these face masks, they must have escaped around the mask edges and found their way into the wound” human albumin cells aka aborted fetal tissue, is much larger than the virus and still escaped the mask.
Study article: https://pubmed.ncbi.nlm.nih.gov/7379387/
15. Testing the efficacy of homemade masks: would they protect in an influenza pandemic?
“Our findings suggest that a homemade mask should only be considered as a last resort to prevent droplet transmission from infected individuals” so why have the government suggested you make your own when they are not effective ?
Study article: https://pubmed.ncbi.nlm.nih.gov/24229526/
16. Using half-facepiece respirators for H1N1
“Increasing the filtration level of a particle respirator does not increase the respirator’s ability to reduce a user’s exposure to contaminants”
https://pubmed.ncbi.nlm.nih.gov/19927872/
17. Why Masks Don’t Work Against COVID-19
The site is full of studies proving masks dont work for coronavirus or the flu.
18. Masks Don’t Work: A Review of Science Relevant to COVID-19 Social Policy
This is full of studies proving mask protection is negligible for coronavirus, flu etc
19. Face masks to prevent transmission of influenza virus: a systematic review
There is fewer data to support the use of face masks or respirators to prevent becoming infected.
Study article: https://pubmed.ncbi.nlm.nih.gov/20092668/
20. “Exercise with facemask; Are we handling a devil’s sword?” – A physiological hypothesis
No evidence to suggest that wearing a mask during exercise offers any benefit from the droplet transfer from the virus.
“Exercising with facemasks may reduce available Oxygen and increase air trapping preventing substantial carbon dioxide exchange. The hypercapnic hypoxia may potentially increase acidic environment, cardiac overload, anaerobic metabolism and renal overload, which may substantially aggravate the underlying pathology of established chronic diseases”
Study article: https://pubmed.ncbi.nlm.nih.gov/32590322/
21. Use of face masks by non-scrubbed operating room staff: a randomized controlled trial
Surgical site infection rates did not increase when non-scrubbed personnel did not wear face masks. 2010
Study article: https://pubmed.ncbi.nlm.nih.gov/20575920/
22. Surgical face masks in modern operating rooms – a costly and unnecessary ritual?
When the wearing of face masks by non-scrubbed staff working in an operating room with forced ventilation seems to be unnecessary.
Study article: https://pubmed.ncbi.nlm.nih.gov/1680906/
23. Masks: a ward investigation and review of the literature
Wearing multi layer operating room masks for every visit had no effect on nose and throat carriage rates.
Study article: https://pubmed.ncbi.nlm.nih.gov/2873176/
24. Aerosol penetration and leakage characteristics of masks used in the health care industry
The protection provided by surgical masks may be insufficient in environments containing potentially hazardous submirconometer-sized aerosols.
“Conclusion: We conclude that the protection provided by surgical masks may be insufficient in environments containing potentially hazardous submicrometer-sized aerosols”
Study article: https://pubmed.ncbi.nlm.nih.gov/8239046/
25. Masks for prevention of viral respiratory infections among health care workers and the public: PEER umbrella systematic review
Meta analysis review that says there is limited evidence to suggest that the use of masks may reduce the risk of spreading viral respiratory infections.
Study article: https://pubmed.ncbi.nlm.nih.gov/32675098/
26. Modeling of the Transmission of Coronaviruses, Measles Virus, Influenza Virus, Mycobacterium tuberculosis, and Legionella pneumophila in Dental Clinics
Evidence to suggest that transmission probability is strongly driven by indoor air quality, followed by patient effectiveness and the least by respiratory protection via mask use.
So this could explain “second waves” and has nothing to do with hand shaking, or not wearing a mask.
Study article: https://pubmed.ncbi.nlm.nih.gov/32614681/
27. Nonpharmaceutical Measures for Pandemic Influenza in Nonhealthcare Settings-Personal Protective and Environmental Measures
The use of face masks, either by infected or non infected peresons, does not have a significant effect on influenza transmission.
SO MASKS DON’T PROTECT YOU FROM ME, AND VICE VERSA.
Study article: https://pubmed.ncbi.nlm.nih.gov/32027586/
28. Effectiveness of personal protective measures in reducing pandemic influenza transmission: A systematic review and meta-analysis
Meta analyses suggest that regular hand hygiene provided a significant protective effect over face masks and their insignificant protection.
Study article: https://pubmed.ncbi.nlm.nih.gov/28487207/
29. Effectiveness of N95 respirators versus surgical masks against influenza: A systematic review and meta-analysis
Use of n95 respirators compared to surgical masks is not associated with a lower risk of laboratory confirmed influenza.
Study article: https://pubmed.ncbi.nlm.nih.gov/32167245/
30. Adolescents’ face mask usage and contact transmission in novel Coronavirus
Face masks surfaces can become contamination sources. People are storing them in their pockets, bags, putting them on tables, people are reusing them etc. This is why this study is relevant:
Study article: https://pubmed.ncbi.nlm.nih.gov/32582579/
31. Visualizing the effectiveness of face masks in obstructing respiratory jets
Loosely folded face masks and “bandana style” face coverings provide minimum stopping capability for the smallest aerosolized droplets.
This applies to anyone who folds or shoves a mask into their pockets or bad. It also applies to cloth and homemade cloth masks:
Study article: https://pubmed.ncbi.nlm.nih.gov/32624649/
32. Use of surgical face masks to reduce the incidence of the common cold among health care workers in Japan: a randomized controlled trial
Face mask use in healthcare workers has not been demonstrated to provide benefit in terms of colds symptoms or getting colds.
Study article: https://pubmed.ncbi.nlm.nih.gov/19216002/
33. A cluster randomised trial of cloth masks compared with medical masks in healthcare workers
Penetration of cloth masks by influenza particles was almost 97 percent and medical masks 44 percent. so cloth masks are essentially useless, and “medical grade” masks don’t provide adequate protection.
Study article: https://pubmed.ncbi.nlm.nih.gov/25903751/
34. Simple respiratory protection–evaluation of the filtration performance of cloth masks and common fabric materials against 20-1000 nm size particles
Cloth masks and other fabric materials tested in the study had 40-90 percent instantaneous penetration levels against polydisperse NaCl aerosols.
“Results obtained in the study show that common fabric materials may provide marginal protection against nanoparticles, including those in the size ranges of virus-containing particles in exhaled breath”
Study article: https://pubmed.ncbi.nlm.nih.gov/20584862/
35. Respiratory performance offered by N95 respirators and surgical masks: human subject evaluation with NaCl aerosol representing bacterial and viral particle size range
“The study indicates that N95 filtering facepiece respirators may not achieve the expected protection level against bacteria and viruses”
Study article: https://pubmed.ncbi.nlm.nih.gov/18326870/
36. Do N95 respirators provide 95% protection level against airborne viruses, and how adequate are surgical masks?
The n95 filtering respirators may not provide expected protection level against small virons
Study article: https://pubmed.ncbi.nlm.nih.gov/16490606/
37. Do Surgical Masks Stop the Coronavirus?
Study article: https://slate.com/news-and-politics/2020/01/coronavirus-surgical-masks-china.html
38. Effectiveness of personal protective measures in reducing pandemic influenza transmission: A systematic review and meta-analysis
This study states that an N95, depending on the brand, can range from 0.1-0.3 microns. however, most people cannot buy an N95 with a micron smaller than 0.3 micron because they are expensive and not readily available on the public market.
“N95 respirators made by different companies were found to have different filtration efficiencies for the most penetrating particle size (0.1 to 0.3 micron)”
” Above the most penetrating particle size the filtration efficiency increases with size; it reaches approximately 99.5% or higher at about 0.75 micron”
” Meta-analyses suggest that regular hand hygiene provided a significant protective effect (OR=0.62; 95% CI 0.52-0.73; I2=0%), and facemask use provided a non-significant protective effect (OR=0.53; 95% CI 0.16-1.71; I2=48%) against 2009 pandemic influenza infection”
Study article: https://pubmed.ncbi.nlm.nih.gov/28487207/
39. Effectiveness of N95 respirators versus surgical masks against influenza: A systematic review and meta-analysis
“The use of N95 respirators compared with surgical masks is not associated with a lower risk of laboratory-confirmed influenza. It suggests that N95 respirators should not be recommended for the general public, neither non high-risk medical staff who are not in close contact with influenza patients or suspected patients”
N95 masks did show a positive effect for BACTERIA but not viruses.
Study article: https://pubmed.ncbi.nlm.nih.gov/32167245/
40. Adolescents’ face mask usage and contact transmission in novel Coronavirus
This study used dye to show if masks were contaminated. “As a result, masks surface become a contamination source. In the contact experiment, ten adults were requested to don and doff a surgical mask while doing a word processing task. The extended contamination areas were recorded and identified by image analysis”
Study article: https://pubmed.ncbi.nlm.nih.gov/32582579/
41. Use of surgical face masks to reduce the incidence of the common cold among health care workers in Japan: a randomized controlled trial
“Of the 8 symptoms recorded daily, subjects in the mask group were significantly more likely to experience headache during the study period”
“Face mask use in health care workers has not been demonstrated to provide benefit in terms of cold symptoms or getting colds”
Study article: https://pubmed.ncbi.nlm.nih.gov/19216002/
42. Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers : A Randomized Controlled Trial
“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 percent in a community with modest infection rates, some degree of social distancing, and uncommon general mask use”
Study article: https://pubmed.ncbi.nlm.nih.gov/33205991/
43. A cluster randomised trial of cloth masks compared with medical masks in healthcare workers
“An analysis by mask use showed ILI (RR=6.64, 95 percent CI 1.45 to 28.65) and laboratory-confirmed virus (RR=1.72, 95 percent CI 1.01 to 2.94) were significantly higher in the cloth masks group compared with the medical masks group. Penetration of cloth masks by particles was almost 97 percent and medical masks 44 percent”
Study article: https://pubmed.ncbi.nlm.nih.gov/25903751/
44. Respiratory performance offered by N95 respirators and surgical masks: human subject evaluation with NaCl aerosol representing bacterial and viral particle size range
“The study indicates that N95 filtering facepiece respirators may not achieve the expected protection level against bacteria and viruses. An exhalation valve on the N95 respirator does not affect the respiratory protection”
Study article: https://pubmed.ncbi.nlm.nih.gov/18326870/
45. Performance of N95 respirators: filtration efficiency for airborne microbial and inert particles
Coronavirus is 0.125 micron, as you can read in this study, it states that most N95 masks can only filter particles as small as 0.75 microns. This is too big to trap this virus. that is a fact.
And even with an efficiency of 95 percent (depending on brand, so filtration may be lower) IF the virus can be trapped… it’s still missing 5 percent and maybe more based on an N95 that has 0.1 microns .
Study article: https://pubmed.ncbi.nlm.nih.gov/9487666/
CORONAVIRUSES ARE 0.125 MICRON. SO THE BEST N95 ON THE MARKET WOULD DO NOTHING
46. A Novel Coronavirus from Patients with Pneumonia in China, 2019
a chinese study that proves that an airborne coronavirus particle (0.125 micron) can pass directly through an n95 mask
Study article: https://pubmed.ncbi.nlm.nih.gov/31978945/
47. Airborne coronavirus particle (<0.125 micron) will pass directly through a N95 face mask.
Study article: https://www.greenmedinfo.com/article/airborne-coronavirus-particle
SIZE OF THE CORONAVIRUS.
Size can vary but all are smaller than 0.3 micron .
“Human coronaviruses measure between 0.1 and 0.2 microns, which is one to two times below the cutoff”
This “cut off” is referring to the size an N95 mask can trap. Most of us, are not using MEDICAL or regular N95s.
The next blog post will detail the face mask side effects and health implications.
