Should a mask be worn to prevent illness?

In the wake of recent global health news, you may be wondering how you can protect yourself from viral illnesses, and if you can and/or should do so by using a mask.   Our filters block 99.9% of particulates down to .1 micron – a rate that is known to be effective toward most airborne pathogens like influenza and SARS, especially in the form of ...
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