Paper money and coins as potential vectors of transmissible disease.
https://money.com/money-cash-currency-bacteria-disease-sickness/
https://www.ncbi.nlm.nih.gov/pubmed/24571076
https://www.medscape.com/viewarticle/821787_5
Apple Pay? Venmo? Facebook Libra? FEDcoin?
or
Bitcoin?
It's going to happen, so ask yourself which level of centralization has worked in the past vs. which do you prefer in the future…
Smart dialogue on Coronavirus and currency vectors: https://www.coindesk.com/coronavirus-impacts-on-bitcoin-and-the-irss-dumb-singularity