Table 2.
Estimated State-Level Proportions of the Population Ever Infected and Infection Fatality Ratios as of December 2020 in the United States
| State | Estimated Average IFR (95% credible interval) | Percent Ever Infected as of 31 Dec 2020 (95% credible interval) |
|---|---|---|
| Alaska | 0.27 (0.25–0.29) | 12.1 (11.1–13.2) |
| Alabama | 0.55 (0.52–0.58) | 24.1 (22.9–25.3) |
| Arkansas | 0.87 (0.82–0.92) | 16.6 (15.7–17.6) |
| Arizona | 0.87 (0.83–0.92) | 18.8 (17.8–19.7) |
| California | 0.54 (0.51–0.58) | 16.2 (15.3–17.3) |
| Colorado | 0.6 (0.54–0.66) | 16 (14.4–17.6) |
| Delaware | 0.66 (0.62–0.7) | 16.9 (15.9–17.9) |
| Florida | 0.73 (0.69–0.77) | 16.6 (15.7–17.5) |
| Georgia | 0.55 (0.53–0.58) | 22.6 (21.5–23.7) |
| Hawaii | 0.52 (0.41–0.67) | 4.6 (3.6–5.8) |
| Iowa | 0.45 (0.43–0.48) | 31 (29.5–32.5) |
| Idaho | 0.56 (0.5–0.64) | 16.7 (14.8–18.9) |
| Illinois | 0.48 (0.46–0.5) | 32 (30.8–33.3) |
| Indiana | 1.36 (1.13–1.65) | 10.7 (8.8–12.9) |
| Kansas | 0.64 (0.6–0.68) | 18.7 (17.5–19.9) |
| Kentucky | 0.48 (0.45–0.51) | 15.5 (14.6–16.5) |
| Louisiana | 0.86 (0.82–0.91) | 20.5 (19.5–21.6) |
| Maryland | 0.49 (0.47–0.52) | 22.3 (21.1–23.5) |
| Maine | 1.2 (0.98–1.51) | 3 (2.4–3.7) |
| Michigan | 0.73 (0.68–0.77) | 20 (18.8–21.5) |
| Minnesota | 0.47 (0.45–0.5) | 22.3 (21.2–23.5) |
| Missouri | 0.52 (0.49–0.55) | 20.1 (19.1–21.1) |
| Mississippi | 0.78 (0.74–0.81) | 23.7 (22.6–24.9) |
| Montana | 0.67 (0.6–0.74) | 16 (14.4–17.7) |
| North Carolina | 0.58 (0.54–0.62) | 14.1 (13.2–15) |
| Nebraska | 0.31 (0.3–0.33) | 30.5 (29.2–31.9) |
| New Hampshire | 1.69 (1.5–1.93) | 4.1 (3.6–4.6) |
| New Mexico | 0.69 (0.65–0.73) | 20.4 (19.3–21.6) |
| Nevada | 0.55 (0.52–0.58) | 23.6 (22.5–24.7) |
| New York | 0.44 (0.43–0.46) | 37.9 (36.4–39.5) |
| Ohio | 0.54 (0.52–0.57) | 25 (23.8–26.3) |
| Oklahoma | 0.5 (0.47–0.53) | 16 (14.9–17) |
| Oregon | 0.55 (0.5–0.61) | 7.7 (7–8.5) |
| Pennsylvania | 0.6 (0.57–0.63) | 25.1 (23.9–26.3) |
| South Carolina | 0.75 (0.71–0.79) | 17.1 (16.2–18.1) |
| South Dakota | 0.75 (0.61–0.99) | 25.1 (19.1–31.1) |
| Tennessee | 0.5 (0.48–0.53) | 25.6 (24.4–26.9) |
| Texas | 0.51 (0.48–0.53) | 23.1 (22–24.2) |
| Utah | 0.21 (0.19–0.23) | 23.9 (21.8–25.9) |
| Virginia | 0.74 (0.68–0.8) | 9.7 (9–10.5) |
| Vermont | 1.07 (0.78–1.52) | 2.4 (1.7–3.3) |
| Washington | 0.69 (0.63–0.76) | 7.8 (7.1–8.6) |
| Wisconsin | 0.35 (0.33–0.37) | 29.2 (27.8–30.7) |
| West Virginia | 0.92 (0.84–1.02) | 10.3 (9.3–11.3) |
| Wyoming | 0.4 (0.35–0.45) | 22.9 (20–26.2) |
Five states (Connecticut, District of Columbia, Massachusetts, New Jersey, Rhode Island) were excluded because of the bad fit to the data. One state (North Dakota) was excluded due to the limited seroprevalence data to fit the model.
Abbreviation: IFR, infection fatality ratio.