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.
I don't really think that the coronavirus is transmitted via touching paper money,coins or anything else.
It's transmitted via air and moisture.Even if its was transmitted via touching paper money,you can see that people all over China are using gloves now.Switching from fiat money to digital money will lead to more people using Wechat Pay(like you mentioned) because it's more convenient than BTC.Very few merhcants and buyers might switch to Bitcoin or any other altcoin.