The biggest cryptocurrency slumped as much as 24 percent during morning trading before clawing back some of its losses. It was last down 18 percent at $6,500, still on course for its biggest daily loss in five years.
It has lost around 30 percent of its value in the last five days, outpacing sharp losses for assets from stocks to oil as the pandemic wreaks havoc on the daily life of millions.
"We've seen de-risking across all asset markets," said Jamie Farquhar, portfolio manager at London-based crypto firm NKB. "Bitcoin is certainly not immune to that."
Global stocks plunged into a bear market and oil slumped on Thursday after US President Donald Trump banned travel from Europe to stem the coronavirus.
With traders citing a rush away from risky assets across all asset classes, Bitcoin's fall has undermined arguments that it acts as a safe haven in times of geopolitical stress.
The slump has also underlined nagging questions over Bitcoin's practicality as a currency. Prone to wild and often inexplicable price swings, it has failed to take off as a means of payment and is used mainly a speculative token.
Bitcoin had risen by nearly half in the first six weeks of the year as investors bet that a combination of arcane tech factors in its code and expectations of mainstream acceptance were leading to a repricing.