r/worldnews – Japan researchers show masks do block coronavirus, but not perfectly

There is this very simple filter theory in almost every industry, public health included.

One layer of filter may not work perfectly. Layers together could work wonders.

In our daily life, this multiple layers of filters are used everywhere. The most common one is the filter system in water processing plant for our tab water.

A simple math, let’s say social distance reduces virus spread by 40%, mask by 40%, contact tracing by 40%, temperature checking at public place by 20%. Together it would reduce by 1 – 0.6 * 0.6 * 0.6 * 0.8, 82%.

It is very strange this common sense seems to have been forgotten even at this stage.

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