For flu they might on the off chance that they might spread a bacterial infection to the patient who is already weakened. And since they are already in the hospital it is officially serious.
For a visit to the doctors office they do not put on masks. Not even when the far more dangerous H1N1 was making it's rounds.
But you go ahead and put on your submission signal. It make you FEEL like you are doing something and that is all that matters. It is like one big participation trophy that you can wear for all to see.
Why don't you wear scrubs, a lab coat and a stethoscope too?
That way you can show how much you really care.
Well, I wear the scrubs and a stethoscope every day.
And every varicella, rubeola, and influenza patient in the United States is cared for in an isolation room, and every worker who enters that room wears a mask.