Study: Evidence of major differences between Omicron BA.2 and BA.1:

BA.2 has
1. Higher R 1.4X (growing around the world)
2. More vaccine evading
3. Resistant to BA.1 induced immunity.
4. Higher severity (pathogenicity): More rapid and more extensive lung damage in hamsters

1/ pic.twitter.com/tW7QFm5mXf

— Yaneer Bar-Yam (@yaneerbaryam) February 17, 2022