On Saturday our pharmacy stopped accepting cash. Credit cards and checks are okay. Today our credit union was ATM and drive-thru only. The cash from the drive-thru was all new bills. China is destroying a lot of cash and printing new bills. Cash passes through many hands. Checks just the writer and the clerk(s). Credit cards have passed thru many hands but as restaurant dining rooms and bars shutdown fewer and fewer.
The coronavirus persists 4-6 hours on absorbent surfaces like cloth, paper, and presumably cash. Hard surfaces like credit cards 10-12 hours. Near Field Communications (NFC) devices like Apple Pay and Google Pay are contact-less, so no transmission as long as you don’t sneeze or cough.