A man stationed at the door, washing down the shopping carts. A plexiglass plate between the clerk and the buyer in the check-out lanes. Those are things I'm seeing in grocery stores.
I've another suggestion: fans in the check-out lanes, about waist high. These would catch the person's germs as they talked and carry them upward and away from harm. The problem might be in what became of those germs at that point. Do you have a ventilator in the ceiling, sucking them up and out? If not, the germs might but simply float around the store awhile and then fall back down on another customer.
From my study of the moment, germs spread by talking and breathing might be as common as any transmission. I have learned they do hang in the air -- for maybe two hours. This might be just germs spread by coughing and sneezing, but I believe not. Cup your hand in front of your mouth or nose. Notice the moisture that is emitted. Do we suppose germs are only on the droplets from coughing and sneezing, but not on those little moisture particles you feel as you cup your hand in front of your mouth? Germs are germs. They'll kill as fast if they come from common breathing as they will if they come from a cough or sneeze.
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