Ask the doctor
Do I have to wear a mask to protect myself from MERS-CoV, doctor?
Is not the duty of all people to wear medical masks “quantum” only in certain situations .. such as the appearance of disease symptoms SGRF-19 in particular “cough”, or in case you are offering medical care to people potentially infected with MERS-CoV. And watch then you don’t have to repeat the use of quantum and single-use most of the time.
So if you are not sick, respiratory problems or caring for someone who is infected with one of these problems there is no need to waste your gags unnecessarily .. must be prudent in the use of gags, especially in light of the shortage of supply of respirators in the world. You just have to follow the safety precautions and personal.