I watched a Youtube video last night about the food merchants in some of the markets in Wuhan and I noticed that most of them are using electronic payment methods to pay for goods. < Wechat Pay >
Ok, it is not Bitcoin, but if more merchants using Fiat currency can switch over to Bitcoin, you might see less infections. The reason for this is simple, because the Corona virus can be transmitted from person to person via cash being used on a daily basis.
People can also do online payments with Bitcoin to avoid handling physical cash and thus avoiding infection. It can also prevent people from being infected from a host of other viruses and bacteria that can survive for days on physical coins and notes.
This is just one more reason for people to move away from physical payment methods and shifting to a cash-less financial system in the future.

Following your logic, the world should become like the world in the movie Demolition Man. There, because of the fear of disease, people refused to shake hands, use paper money and etc. I agree that online payments are the future, but your reason why people should refuse fiat money looks ridiculous