How did the omicron coronavirus variant evolve to be so dangerous?

How reliable are covid-19 lateral flow tests for detecting omicron?

The omicron variant multiplies about 70 times faster inside human respiratory tract tissue than the delta variant does, scientists at the University of Hong Kong report. The variant also reaches higher levels in the tissue, compared with delta, 48 hours after infection.

Why Is Omicron So Contagious?