If you could smack a few million people upside the back of the head and get them to actually, in fact, practice the hygiene stuff that gets repeated all the time and utterly ignored, you could save thousands of lives.
Stop touching your face.
Stop touching your face.
Train cashiers to practice actual germ control.
Don't let them lick their fingers to open bags. Fire them if they do stuff like touch their nose and then immediately handle money or lick their fingers to open bags.
The single biggest obstacle to germ control is the fact that most humans don't want to actually practice it. Making it a widespread habit would nearly put a stop to most epidemics all on its own, but we are too busy sticking our heads up our butts to do that.