Opinion: What we know – and don’t know – about masks

Hedi Zhao and Sukhdeep Jatana are medical students at McGill University. Mark Loeb is an infectious disease physician and professor of pathology and molecular medicine at McMaster University.

Over the course of the century masks underwent continual evolution, from Berger’s rudimentary six strips of gauze to the development of the N95 mask in 1972 by 3M. Today, surgical masks are commonly worn by healthcare workers within the operating room to protect the sterile field.

Medical masks, also known as surgical masks, similarly undergo regulated testing, but often using less stringent standards, as they are intended to trap the wearer’s secretions and deal primarily with large droplets. When tested against the same standards as respirators, their filtration is highly variable depending on the model, ranging from 10 per cent to 90 per cent.

The COVID19 mask message is actually quite simple - which, unfortunately, this article is not. Here it is: You can infect others with Covid 19 before you know you have it yourself. So for their protection you need to wear a mask and keep your distance. That's it.

They do not stop the virus.... masks. It’s bullshite. Stop this insanity. This BS from our politicians Is strictly political posturing. This has nothing to do with health, this is taking away our civil liberties and freedoms. This is government tyranny.

They are placebos for stupid people to feel safe?

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