This shows just how quickly Omicron Spreads because of extreme contagiousness:

One December 4th 2021 there was only a .7% spread of Omicron in the U.S.

On December 11th 2021 it went to 12.6% only 6 days later.

Then on December 18th it reached 73.2% of Covid Cases in the U.S. 

and this now makes it the dominant strain in the U.S.  in  just 2 weeks time.

this is as of 1:02 pm Pacific Time on December 21st 2021 from CNN TV