Cultures of random samples of both coin and paper money revealed that 13% of the coins and 42% of the paper money were contaminated by potential pathogens. The implications lead to the conclusion that no abrupt departure from our present monetary habit is imminent.
Abrams BL, Waterman NG. Dirty Money. JAMA. 1972;219(9):1202-1203. doi:10.1001/jama.1972.03190350038011