European Central Bank chief Christine Lagarde warned on Thursday that the pandemic still poses "serious risks" to the eurozone economy as concerns grow about new virus variants and sluggish vaccination campaigns.The Frankfurt institution's governing council held back from tweaking its ultra-loose monetary policy at its first meeting of the year, having already topped up up support in December.Lagarde stressed that "ample monetary stimulus" remained essential to steer the 19-nation currency club through the Covid-19 upheaval, and that the ECB stood ready to do more as needed."The pandemic continues to pose serious risks to public health and to the euro area and global economies," Lagarde told an online press conference.The start of mass.