Scientists Research 'Stealth Omicron' COVID Strain

Last week, scientists identified a second sublineage of Omicron called BA.2.

Scientists have detected a new type of Omicron that may complicate surveillance efforts.

It's nicknamed "Stealth Omicron."

Researchers have separated Omicron into two sublineages. BA.1, the original sublineage, is by far the most prevalent. It's found in 49 countries and it’s rapidly replacing the delta variant.