‘Stealth’ version of Omicron

Subject – Science and Tech

Context – In Denmark, ”Stealth” version of Omicron has spread quickly and become the dominant variant

Concept –

Scientists and health officials around the world are keeping their eyes on a descendant of the Omicron variant that has been found in more than 50 countries, including the United States.
This version of the coronavirus, which scientists call BA.2, is widely considered stealthier than the original version of Omicron because particular genetic traits make it somewhat harder to detect.
Danish scientists reported this week that preliminary information suggests it may be one and a half time more contagious then the original variant.
The mutant appears much more common in Asia and Europe.

What’s known about this version of the virus?

2 has lots of mutations. About 20 of them in the spike protein that studs the outside of the virus are shared with the original Omicron. But it also has additional genetic changes not seen in the initial version.
For now, the original Omicron BA.1 and its descendant BA.2 are considered subsets of Omicron. But global health leaders could give it its own Greek letter name if it is deemed a globally significant “variant of concern.”
Looking at all vaccine brands combined, scientists found they were about 70 per cent effective against symptomatic disease from BA.2 two or more weeks after a booster shot.