Immunity generating omicron subvarients circulating widely in the United States.
CDC data: https://covid.cdc.gov/covid-data-trac…
Omicron BA.2 in US, April 16th:
https://www.medscape.com/viewarticle/…
https://covid.cdc.gov/covid-data-trac…
93.4% of the coronavirus variants circulating in the United States. 19% BA.2.12.1