Omicron and its sublineages account for 100% of new cases
New data shows the omicron variant and its sublineages are estimated to account for 100% of new infections. The omicron variant now has three major sublineages: BA.1.1, BA.2 and BA.3.
The "original" omicron variant that overtook the globe in November now accounts for 20.6% of new COVID-19 cases in the U.S., according to the CDC.
The closely-related sublineage BA.1.1 has been the dominant strain since early January and is estimated to account for 75.6% of new cases.
The CDC estimates that as of Feb. 19, BA.2 accounts for about 3.8% of new cases in the U.S.
The World Health Organization has asked countries to monitor the BA.2 sublineage to see whether it behaves differently. At this time experts don't expect BA.2 to lead to another surge, but some are worried that it may slow the current drop in new cases.
BA.3 accounts for a very small proportion of new cases.
-ABC News' Arielle Mitropoulos, Sony Salzman