Neil W M1 Orr MD Mchir FRCS "Is a mask necessary in the operating theatre?"
No masks were worn in one operating theatre for 6 months. There was no increase in the incidence of wound infection.
Ritter et al., in 1975, found that "... the wearing of a surgical face mask had no effect upon the overall operating room environmental contamination."
Ha’eri and Wiley, in 1980, applied human albumin microspheres to the interior of surgical masks in 20 operations. At the end of each operation, wound washings were examined under the microscope. "Particle contamination of the wound was demonstrated in all experiments."
Laslett and Sabin, in 1989, found that caps and masks were not necessary during cardiac catheterization. "No infections were found in any patient, regardless of whether a cap or mask was used," they wrote. Sjøl and Kelbaek came to the same conclusion in 2002.
In Tunevall’s 1991 study, a general surgical team wore no masks in half of their surgeries for two years. After 1,537 operations performed with masks, the wound infection rate was 4.7%, while after 1,551 operations performed without masks, the wound infection rate was only 3.5%.
A review by Skinner and Sutton in 2001 concluded that "The evidence for discontinuing the use of surgical face masks would appear to be stronger than the evidence available to support their continued use."
Lahme et al., in 2001, wrote that Surgical face masks worn by patients during regional anaesthesia, did not reduce the concentration of airborne bacteria over the operation field in our study. Thus they are dispensable.
Figueiredo et al., in 2001, reported that in five years of doing peritoneal dialysis without masks, rates of peritonitis in their unit were no different than rates in hospitals where masks were worn.
Bahli did a systematic literature review in 2009 and found that "No significant difference in the incidence of postoperative wound infection was observed between masks groups and groups operated with no masks."
Surgeons at the Karolinska Institute in Sweden, recognizing the lack of evidence supporting the use of masks, ceased requiring them in 2010 for anesthesiologists and other non-scrubbed personnel in the operating room. "Our decision to no longer require routine surgical masks for personnel not scrubbed for surgery is a departure from common practice. But the evidence to support this practice does not exist," wrote Dr. Eva Sellden.
Webster et al., in 2010, reported on obstetric, gynecological, general, orthopaedic, breast and urological surgeries performed on 827 patients. All non-scrubbed staff wore masks in half the surgeries, and none of the non-scrubbed staff wore masks in half the surgeries. Surgical site infections occurred in 11.5% of the Mask group, and in only 9.0% of the No Mask group.
Lipp and Edwards reviewed the surgical literature in 2014 and found “no statistically significant difference in infection rates between the masked and unmasked group in any of the trials.” Vincent and Edwards updated this review in 2016 and the conclusion was the same.
Carøe, in a 2014 review based on four studies and 6,006 patients, wrote that “none of the four studies found a difference in the number of post-operative infections whether you used a surgical mask or not.”
Salassa and Swiontkowski, in 2014, investigated the necessity of scrubs, masks and head coverings in the operating room and concluded that “there is no evidence that these measures reduce the prevalence of surgical site infection.”
Da Zhou et al., reviewing the literature in 2015, concluded that “there is a lack of substantial evidence to support claims that facemasks protect either patient or surgeon from infectious contamination.”
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_wStudy
https://www.theblaze.com/op-ed/horowitz-cdc-study-covid-masks
Study Article: https://pubmed.ncbi.nlm.nih.gov/32371574/
Study Article: https://pubmed.ncbi.nlm.nih.gov/33215698/
Study Article: https://pubmed.ncbi.nlm.nih.gov/27115326/
Study Article: https://pubmed.ncbi.nlm.nih.gov/16295987/
Study Article: https://pubmed.ncbi.nlm.nih.gov/27531371/
Study Article: https://pubmed.ncbi.nlm.nih.gov/4014006/
Study Article: https://pubmed.ncbi.nlm.nih.gov/29910210/
Study Article: https://pubmed.ncbi.nlm.nih.gov/1524265/
Study Article: https://pubmed.ncbi.nlm.nih.gov/33052962/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32503823/
Study Article: https://pubmed.ncbi.nlm.nih.gov/16920222/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32838296/
Study Article: https://pubmed.ncbi.nlm.nih.gov/7379387/
Study Article: https://pubmed.ncbi.nlm.nih.gov/24229526/
https://www.citizensforfreespeech.org/why_masks_don_t_work_against_covid_19
Study Article: https://pubmed.ncbi.nlm.nih.gov/20092668/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32590322/
Study Article: https://pubmed.ncbi.nlm.nih.gov/20575920/
Study Article: https://pubmed.ncbi.nlm.nih.gov/1680906/
Study Article: https://pubmed.ncbi.nlm.nih.gov/2873176/
Study Article: https://pubmed.ncbi.nlm.nih.gov/8239046/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32675098/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32614681/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32027586/
Study Article: https://pubmed.ncbi.nlm.nih.gov/28487207/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32167245/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32582579/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32624649/
Study Article: https://pubmed.ncbi.nlm.nih.gov/19216002/
Study Article: https://pubmed.ncbi.nlm.nih.gov/25903751/
Study Article: https://pubmed.ncbi.nlm.nih.gov/20584862/
Study Article: https://pubmed.ncbi.nlm.nih.gov/18326870/
Study Article: https://pubmed.ncbi.nlm.nih.gov/16490606/
Study Article: https://slate.com/news-and-politics/2020/01/coronavirus-surgical-masks-china.html
Study Article: https://pubmed.ncbi.nlm.nih.gov/28487207/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32167245/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32582579/
Study Article: https://pubmed.ncbi.nlm.nih.gov/33205991/
Study Article: https://pubmed.ncbi.nlm.nih.gov/25903751/
Study Article: https://pubmed.ncbi.nlm.nih.gov/18326870/
Study Article: https://pubmed.ncbi.nlm.nih.gov/9487666/
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.https://www.sciencedirect.com/science/article/abs/pii/S1130147308702355?via%3Dihub
Study Article: https://pubmed.ncbi.nlm.nih.gov/18500410/
Study Article: https://pubmed.ncbi.nlm.nih.gov/31280156/
Study Article: https://pubmed.ncbi.nlm.nih.gov/26579222
“It is known that the N95 mask, if worn for hours, can reduce blood oxygenation in as much as 20 percent, which can lead to a loss of consciousness, as happened to the hapless fellow driving around alone in his car wearing an N95 mask, causing him to pass out, crash his car and sustain injuries. I am sure that we have several cases of elderly individuals or any person with poor lung function passing out, hitting their head. This, of course, can lead to death” “CONCLUSIONS: Breathing through N95 mask materials have been shown to impede gaseous exchange and impose an additional workload on the metabolic system of pregnant healthcare workers, and this needs to be taken into consideration in guidelines for respirator use” Yet we force pregnant women to use them...? What could this do to the fetus?Study Article: https://pubmed.ncbi.nlm.nih.gov/16441251/
Headaches Associated With Personal Protective Equipment – A Cross-Sectional Study Among Frontline Healthcare Workers During COVID-19Study Article: https://pubmed.ncbi.nlm.nih.gov/32232837/
How to Avoid Migraine Triggers While Wearing Your MaskStudy Article: https://pubmed.ncbi.nlm.nih.gov/20420727/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32541493/
https://www.everydayhealth.com/coronavirus/your-mask-may-be-causing-candida-growth-in-your-mouth/
https://nypost.com/2020/08/05/mask-mouth-is-a-seriously-stinky-side-effect-of-wearing-masks/
https://www.health.com/condition/skin-conditions/maskne-mask-acne-mechanica
https://www.aa.com.tr/en/health/improper-use-of-medical-masks-can-cause-infections-/1766676
https://moldfreeliving.com/2019/01/26/could-mold-colonization-in-your-sinuses/
Study Article: https://pubmed.ncbi.nlm.nih.gov/7440756/
Study Article: https://pubmed.ncbi.nlm.nih.gov/32556449/
Study Article: https://pubmed.ncbi.nlm.nih.gov/15340662/
Study Article: https://pubmed.ncbi.nlm.nih.gov/6099666/
https://www.hopkinsmedicine.org/health/conditions-and-diseases/allergies-and-the-immune-system
https://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1008234
https://blogs.scientificamerican.com/lab-rat/when-viruses-and-bacteria-unite/
https://www.wishtv.com/news/mask-mandates-may-affect-a-childs-emotional-intellectual-development/
https://www.psychologytoday.com/us/blog/slightly-blighty/202005/the-psychology-wearing-face-mask
https://www.citizensforfreespeech.org/why_masks_don_t_work_against_covid_19
Or from the Cochrane Library see:
Washington Examiner: "'Gold standard' scientific study finds masks are useless against COVID"
Physical interventions to interrupt or reduce the spread of respiratory viruses