http://www.newsweek.com/stealth-omicron-covid-subvariant-how-many-countries-40-1672104

The Omicron BA.2 sub-variant, also dubbed "stealth Omicron," has been detected in at least 40 countries worldwide.

BA.2 has caught attention in recent days as it has been responsible for an increasing proportion of Omicron infections compared to the BA.1 lineage that has been the dominant Omicron type so far.