Covid Omicron Variant BA.2.12.1 Spreading Quickly Across United States; Related Cases Up Nearly 100% In Past Two Weeks
03.05.2022 - 21:19
/ deadline.com
In February, the first few cases of two new, more infectious variants were identified in the Northeastern United States. Dubbed BA.2.12.1 and BA.2.12.2, these sublineages of the BA.2 variant made up only 1.5% of newly-sequenced positive tests before March 19.
But, warned New York State Public Health officials, the new variants are thought to have a 23%–27% growth advantage over BA.2, which itself had an estimated 30% growth advantage over the original Omicron. About 6 weeks later, the numbers support that theory.
For the week ending April 16, BA.2.12.1, which seems to be the more dominant of the two, made up 19% of all newly-sequenced positive Covid tests in the country. Centers For Disease Control data released today show that BA.2.12.1, now makes up 36.5% of all newly-sequenced positive Covid tests. That’s a jump of close to 100% in the past two weeks.
The share of cases related to BA.2.12.1 is even higher in some parts of the U.S.
In the Northeast region defined by New York, New Jersey and Connecticut, where the variant first took hold, it now accounts for 61% of all new cases. Nearby, in the region made up of Delaware, D.C., Maryland, Pennsylvania, Virginia and West Virginia, the share is 40%.
In the Southwest, which seems to be about 2-3 weeks behind the Northeast in the spread of many recent variants, numbers are much lower. CDC figures indicate that in California, Nevada and Arizona, BA.2.12.1 now accounts for 20% of new cases. Across Arkansas, Louisiana, New Mexico, Oklahoma and Texas it is 13.9%. The region defined by Alaska, Oregon, Washington and Idaho has identified the variant in only 12% of its most recent cases.
See the map to the left for a graphical representation of the share of BA.2.12.1 vs. BA.2, which