States ranked by omicron subvariant prevalence

The U.S. had identified 10,333 virus sequences involving the omicron subvariant BA.2 as of April 15, according to outbreak.info, a platform that tracks data on COVID-19 variants and is supported by the CDC and other national research groups.

Nationwide, outbreak.info estimates that BA.2's cumulative prevalence — which represents a ratio of sequences containing BA.2 to all sequences collected in the U.S. since the subvariant was first detected on Dec. 14, 2021 — is 1 percent.

Weekly estimates of BA.2 prevalence from the CDC suggest the subvariant accounted for 85.9 percent of COVID-19 cases in the week ending April 9, up from 75.4 percent in the week ending April 2.

Below is a breakdown of BA.2 prevalence by state and Washington, D.C., based on data from outbreak.info. As COVID-19 sequencing is not a random sample of mutations, the data represents outbreak.info's best estimates of the subvariant's prevalence, as opposed to true prevalence.

Note: Becker's calculated each state's estimated cumulative BA.2 presence using sequencing data from outbreak.info. Figures are rounded to the nearest hundredth.

State

BA.2 positive samples

Total sequences sampled

Estimated cumulative prevalence (%)

Rhode Island

348

16,285

2.14

New Jersey

715

58,726

1.22

Massachusetts

1,470

156,179

0.94

New York

1,550

168,839

0.92

Washington, D.C.

97

10,589

0.92

Hawaii

91

11,529

0.79

Connecticut

300

38,721

0.77

Pennsylvania

406

55,300

0.73

Vermont

113

21,097

0.54

Maine

78

16,590

0.47

Maryland

249

53,827

0.46

New Hampshire

51

11,699

0.44

Illinois

290

70,386

0.41

Virginia

191

48,695

0.39

Florida

536

146,315

0.37

Washington

352

97,095

0.36

Wisconsin

155

56,326

0.28

Arizona

250

98,238

0.25

Texas

509

204,868

0.25

California

1,248

528,781

0.24

Ohio

96

46,362

0.21

Nevada

68

33,438

0.2

Michigan

143

70,773

0.2

North Carolina

140

75,832

0.18

Delaware

24

13,798

0.17

North Dakota

27

15,685

0.17

Georgia

88

53,431

0.16

Kentucky

31

21,676

0.14

South Carolina

31

22,027

0.14

Mississippi

17

12,765

0.13

Utah

105

85,159

0.12

Alaska

14

11,626

0.12

Missouri

30

25,894

0.12

Tennessee

66

57,427

0.11

Louisiana

31

28,042

0.11

Oregon

42

44,707

0.09

Minnesota

100

113,058

0.09

Indiana

29

36,972

0.08

Colorado

141

189,972

0.07

Nebraska

16

21,886

0.07

Idaho

15

21,792

0.07

Kansas

11

19,370

0.06

Oklahoma

3

5,349

0.06

West Virginia

14

27,193

0.05

Arkansas

8

16,006

0.05

Alabama

8

17,283

0.05

Iowa

7

17,171

0.04

Wyoming

7

34,039

0.02

Montana

2

15,926

0.01

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