Have you seen how governments responded to the corona virus?
Quite simply, in Italy, the US and elsewhere, they will increase their budget deficit, and add debt. In my understanding, that's very bad for fiat currencies, while BTC will remain unaffected, thanks to the lockdown on money supply.
That is true because if the Corona Virus has a significant effect on Bitcoin, it would be noticeable on its value but nothing has change even the virus has spread. Bitcoin's value is only affected on the supply and demand on circulation and also the number of users taking interest on it might also affect its value. Fiat currencies would be affected because its used mostly in daily lives and it would also shut down some businesses that only transacts using fiat.