I can’t go past Freud’s reservation:
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Baseball Medical
>> About the medical mask. If it is worn on the patient, the infection settles from the mouth and nose and within an hour the patient receives an additional infection when inhaled.
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You can think of the virus in the mucus, which inside and so on in excess, it is somehow critical. The level of the therapist with such advice (and do not go to the guess, the preparations of the Fuflomycin series in the prescription, starting with Tylorone and Arbilod) is understandable, BUT.
You just have to change the mask.
And yes, a good mask (from 3m for example) perfectly delays everything that flies outside and more dimensional than HERA (High Efficiency Particulate Air), and not bad everything that flies from inside.

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The size of the hero is five. HEPA is now)