Actually it doesn’t tell us much. CDC has considered paper currency a contagion vector for a long time. Absorbent, tends to collect humidity from being in people’s pockets, stays about person temperature, and gets handed from person to person. Cash is a well known disease vector.
Of course, not so long ago, most circulation currency was made of silver, which has natural germ-killing properties that have been understood for centuries.
[[Cash is a well known disease vector.]]
Or, it’s a well known immunity booster