WHO says Omicron coronavirus variant poses very high global risk but data on severity limited
WHO warns COVID pandemic could continue amid vaccine inequalities
Cleaning rules force US airline to turn back flight midair
Omicron sends new US COVID-19 cases soaring to levels higher than pandemic peak
Omicron cancels thousands of Christmas flights worldwide
Booster programs will prolong COVID pandemic, not end it, WHO chief warns
Oil prices rally on inventory drawdown, though Omicron caution lingers
Tidal wave: Omicron threatens to put US COVID-19 surge into overdrive