“going from nothing to 100% in such a short time is quite the accomplishment. What happened to Delta?”
This is how Omicron moves - the fastest variant by far.
It became dominant over Delta in Johannesburg (the 26th biggest city on Earth) just two weeks after it was first detected. No other COVID variant had been able to take dominance from Delta, anywhere on Earth. Omicron not only did it, but it did it much faster than any COVID variant has every risen to dominance.
Omicron case numbers typically double every 2-3 days. In London recently, it was doubling every 1.5 days.
It will likely be the dominant strain in the USA on Christmas (next week), even if the test results have not yet reflected it (as they have not yet in Orlando, even though it can be seen in the current sewage).
Because it grows so fast, the peak of case numbers will likely be higher, before it starts to run out new hosts (approaches herd immunity threshold).
“It became dominant over Delta in Johannesburg (the 26th biggest city on Earth) just two weeks after it was first detected. No other COVID variant had been able to take dominance from Delta, anywhere on Earth. Omicron not only did it, but it did it much faster than any COVID variant has every risen to dominance.”
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I don’t understand how one moving in makes the other go away, though.