Omicron is spreading at lightning speed. Scientists are trying to figure out why

In late November, more than 110 people gathered at a crowded Christmas party at a restaurant in Oslo, Norway. Most of the guests were fully vaccinated. One had returned from South Africa just a few days earlier and was unknowingly carrying the omicron variant of SARS-CoV-2.
Read more: https://www.npr.org/sections/goatsandsoda/2021/12/31/1067702355/omicron-is-spreading-like-wildfire-scientists-are-trying-to-figure-out-why?source=Snapzu