And Please Do Not Sneeze

I'm not much if from paper More substantial if cloth Either way what I cover Can leave me quite wroth So, inside me don't wheeze Neither slurp, nor drool And please do not sneeze Don't play ME for a fool I'm your CV mask -- To keep me germ-free is your daily task -- Scrubbing hands is the key Please wear me outside or if you go for a ride on a bus, on a train or a plane ~ But not when you shower Unless you're wacked-out insane