The central bank announced it will buy unlimited amounts of US Treasury debt - essentially printing money for the economy - as well as new steps to lend directly to small- and medium-sized companies that have been among the hardest-hit as economic activity dries up.
Analysts welcomed the steps, but many expect markets to remain brittle until the world's biggest economy gets a grip on the virus outbreak. "We're going to need to see these growth rates restabilise in order for markets to heal," said Matt Jozoff, managing director, fixed income research.