The difference between hygiene and sanitation is that hygiene is all about taking personal care.
Sanitation is all about taking care of the cleanliness of society as a whole. Hygiene keeps an individual healthy but sanitation keeps the whole society healthy.
There are just too many things living on our hands to wash all of them off.
Killing all the microbes on your hands has never even been the point of hand-washing. The point is to get as big a reduction in microbes as possible while balancing that effort with the demands of real life.
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