It may never happen.
Louis Le Fronde writes:
I noticed this clever face mask when I was in a restaurant in Beijing [China] last year. They were being worn by the chefs, bar staff and waiters. I thought to myself, what a cool device, to avoid spreading germs (colds, flu, bugs etc) and viruses).
I further thought to myself, what if these were mandatory in every bar, cafe and restaurant together with latex gloves and regular handwashing? Could this reduce the spread of colds, infections and other bugs?
Also imagine if these were used in every supermarket, cafe and shop. I wonder how many lost work days would be saved?