In a way, the traditional handshake is being phased out.
It has been replaced, in many circumstances, by the “fist bump.” I actually read an article about this. It stated that the knuckle to knuckle greating had indeed cut down on the spread of disease.
It’s an interesting example of how cultural trends can affect the spreading of something detrimental.
In an unrelated article, I read that “crabs” have been almost eliminated because many women now shave their pubic hair. Without the hair,they cannot hold onto the person, so, in countries where women shave, or wax their vaginas, the cases of “crabs” are exponentially fewer than the countries where women don’t.
An unexpected consequence from a simple change in how humans behave, due to cultural changes.