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You go to the market to buy some meat, take out a brand new hundred-dollar bill, pay, and wait for the change. The shopkeeper has just cut pork, wiped his bloody and sweaty hands on his forehead after wiping the knife, and then takes out a note and some old coins from his pocket and hands them to you. You don't know how many hands these banknotes have passed through or what they have taken with them along the way. The rich nutrients in the gaps between cotton and linen fibers feed tens of thousands of bacteria. Could one of them bring you deadly infectious diseases? [1]