European Central Bank president Christine Lagarde on Wednesday warned of an "unsteady" eurozone recovery from the pandemic despite "encouraging" news about a vaccine. "We could still face recurring cycles of accelerating viral spread and tightening restrictions until widespread immunity is achieved," Lagarde told a virtual forum on central banking, a day after Pfizer and BioNTech said their Covid-19 vaccine had shown 90 percent effectiveness in trials. edf/mfp/bmm