What we know about Omicron variant that has sparked global alarm
Will Christmas be lost to COVID once again? The Omicron strain has been described as "'an unprecedented sampling' of mutations from four earlier variants of concern: Alpha, Beta, Gamma and Delta." As a result, scientists fear it could be more transmissible and have higher resistance to vaccines. Clive Cookson and Oliver Barnes provide a full explainer on the newest variant.
From Financial Times