TABLE 2.
Estimated overall seroprevalence and corresponding percentages of COVID‐19 vaccinations and confirmed COVID‐19 cases by county of residence
| County a | Positive samples | Number of samples tested (%) | Positive samples (all ages), % (95% CI) | Estimated seroprevalence (all ages), % (95% credible interval) | Positive samples (age ≥18 yrs), % (95% CI) | Estimated seroprevalence (age ≥18 yrs), % (95% credible interval) | Percentage of the population vaccinated with the first dose of COVID‐19 vaccine (age ≥18 yrs) b | Percentage of the population with confirmed COVID‐19 (age ≥18 yrs) c |
|---|---|---|---|---|---|---|---|---|
| Oslo | 71 | 115 (6.0) | 61.7 (52.2–70.6) | 63.2 (54.2–71.9) | 78.2 (68.0–86.3) | 79.8 (70.0–88.5) | 80.9 | 5.0 |
| Rogaland | 76 | 123 (6.4) | 61.8 (52.6–70.4) | 63.3 (54.3–72.0) | 77.2 (66.4–85.9) | 78.8 (69.0–87.7) | 66.5 | 1.5 |
| Møre og Romsdal | 80 | 130 (6.7) | 61.5 (52.6–69.9) | 63.1 (54.1–71.8) | 74.2 (68.5–79.3) | 76.1 (70.4–81.5) | 64.0 | 0.7 |
| Nordland | 62 | 126 (6.5) | 49.2 (40.2–58.3) | 50.6 (42.0–59.7) | 61.7 (53.5–69.4) | 63.2 (55.2–71.0) | 63.3 | 0.6 |
| Viken | 222 | 390 (20.2) | 56.9 (51.8–61.9) | 58.4 (53.4–63.5) | 67.0 (56.6–76.4) | 68.5 (58.7–77.5) | 80.8 | 3.4 |
| Innlandet | 66 | 121 (6.3) | 54.5 (45.2–63.6) | 56.1 (47.0–65.1) | 70.9 (63.3–77.7) | 72.7 (65.5–79.8) | 65.9 | 1.5 |
| Vestfold og Telemark | 58 | 125 (6.5) | 46.4 (37.4–55.5) | 47.6 (38.8–56.5) | 67.4 (56.7–77.0) | 68.9 (58.6–78.5) | 73.6 | 2.0 |
| Agder | 50 | 113 (5.9) | 44.2 (34.9–53.9) | 45.6 (36.4–55.0) | 76.5 (66.9–84.5) | 78.2 (68.8–86.6) | 68.7 | 1.7 |
| Vestland | 124 | 246 (12.8) | 50.4 (44.0–56.8) | 51.8 (45.5–58.1) | 73.9 (66.1–80.6) | 75.7 (68.0–82.8) | 70.2 | 1.5 |
| Trøndelag | 116 | 216 (11.2) | 53.7 (46.8–60.5) | 55.1 (47.9–61.9) | 70.4 (59.2–80.0) | 71.8 (61.3–81.6) | 67.3 | 1.1 |
| Troms og Finnmark | 103 | 218 (113) | 472 (405–541) | 486 (417–554) | 590 (473–700) | 603 (494–711) | 62.1 | 1.0 |
| Missing | 1 | 3 (0.2) | 33.3 (0.8–90.6) | n.a d | 50.0 (1.3–98.7) | n.a. | n.a. | n.a. |
a
8 sera were attributed to the county of the submitting laboratory as these sera did not have information on county of residence.
b
Data from SYSVAK, vaccinations by 15 July 2021.
c
Data from Beredt C19, confirmed COVID‐19 cases by 15 July 2021.
d
n.a.: not applicable. Seroprevalence was not estimated for subgroups with less than 30 samples.