As the spread continue people start to panic with the disease not Btc, thinking of many Negatives and some people exchange their Crypto to friendly fiat money so they can cover some emergency staff buys extra food, drinks, masks, etc, the simple view is that many sell result to cheapest sell which automatic kill the prices of an Assets.
So with that logic, obviously the panic about the corona virus is one factor that cause a sharp decline on the price of BTC. Well, you can't take out that there could be whales who take advantage of the situation and play us.
Media did also play a part as well, as they reported the spread and probably blow out everything out of proportion. Nevertheless, bitcoin is very strong and resilient, as other markets are still in shock and have difficulty recovering, bitcoin has been bouncing back from $5000-$6500 or more.