Yale approved study showed cloth masks can’t block the Covid-19 virus

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Yale approved study showed cloth masks can’t block the Covid-19 virus

Yale university approved study showed cloth masks cannnot block the Covid-19 virus.

This is a study called a cluster randomized trial in rural Bangladesh from November 2020 to April 2021.
This cloth mask study was done on 342,126 adults in 600 villages in rural Bangladesh.

Group 1  received nothing
Group 2  surgical masks
Group 3  cloth masks

the intervention effect: 
Group 1  no intervention villages   0.76% (of the total tested positive for Covid-19 and had symptoms, this is less than 1%!)  
Group 3  cloth mask villages          0.74%
Group 2  surgical mask villages      0.67%

conclusion: no significant difference between those that wore cloth masks to those that didn’t wear any masks.

This study showed that cloth masks actually weren’t very helpful.

Mask filtration efficiency:
-by using a particle counter,

a. cloth masks                       37%
b. surgical mask (N95 mask) 95%

*In other words, wearing a cloth mask can only filter out 37% of the virus particles, but N95 mask can filter out  95% of the virus particles.

Dr. Keith Moran MD, RCPSC, DABIM, RCS, NBE Biography:

I am a consultant in Internal Medicine with special medical interests in gastroenterology, cardiology, and echocardiography. I am a a full-time practising physician in these areas. I was an undergraduate at the University of Toronto, Trinity College where I received a number of scholarships including one for top student at Trinity College. I attended medical school at the University of Toronto graduating with a gold medal. My internship was completed at McMaster University in Hamilton followed by a residency in Internal Medicine at the University of Western Ontario in London. I then completed a fellowship in General Internal Medicine at the University of Western Ontario. I am an active echocardiographer who has been certified and recertified by the National Board of Echocardiography. I am certified in cardiac sonography and have trained and completely educated a number of cardiac sonographers. I am the medical director of my cardiology laboratory which was established in 2001. My laboratory performs echocardiography and stress echocardiography amongst other tests. I maintain my certification in the American Board of Internal Medicine. I have over 27 years of experience as a hospital-based consultant in internal medicine and intensive care unit attending physician.

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