It is basically a mutant strain, called XE. It is believed to be a hybrid strain of two Omicron sub-variants -- BA.1 and BA.2. The new variant, XE, however, accounts for a small fraction of cases ...

4 and BA.5 sub-variants of Omicron, according to the European Medicines Agency (EMA). "The wave is driven by BA.4 and BA.5 which are highly-transmissible," Cavaleri added. "Based on current ...

The BA.2 sub-lineage of the Omicron variant of COVID-19, which is classed as a variant under investigation in the UK, spreads much faster than the original BA.1 strain but it also seems to show ...