Table 1.
Average Annual Cases and Incidence (Per 100,000 Population, ±95% CI) of Microbiologically Confirmed Lyme Borreliosis Cases Reported in the National Infectious Diseases Register, of Clinically Diagnosed Lyme Borreliosis Cases Reported in the Register for Primary Health Care Visits (Avohilmo), and of Both Combined by 21 Finnish Hospital Districts for the Years 2015–2020
| No. | Hospital district | Population | Clinically diagnosed LB (Avohilmo) |
Microbiologically confirmed LB (NIDR) |
Total LB (Avohilmo + NIDR) |
|||
|---|---|---|---|---|---|---|---|---|
| Cases | Incidence [95% CI] | Cases | Incidence [95% CI] | Cases | Incidence [95% CI] | |||
| 1 | The Åland Islands | 29,405 | 222 | 756.8 [661.3–862.2] | 504 | 1717.1 [1572.8–1871.1] | 726 | 2473.9 [2300.4–2657.0] |
| 2 | Etelä-Karjala | 130,030 | 216 | 165.6 [144.3–189.2] | 54 | 41.7 [31.3–54.3] | 270 | 207.3 [183.4–233.5] |
| 3 | Kymenlaakso | 169,398 | 216 | 127.8 [111.4–146.0] | 82 | 48.4 [38.5–60.1] | 298 | 176.3 [156.9–197.4] |
| 4 | Varsinais-Suome | 479,456 | 467 | 97.4 [88.8–106.7] | 364 | 75.9 [68.3–84.1] | 831 | 173.3 [161.8–185.5] |
| 5 | Helsingin ja Uudenmaa | 1,645,715 | 1202 | 73.2 [69.1–77.4] | 723 | 43.8 [40.7–47.2] | 1925 | 117.0 [111.8–122.3] |
| 6 | Pohjois-Karjala | 166,954 | 152 | 91.2 [77.8–106.5] | 30 | 17.8 [12–25.4] | 182 | 109.0 [94.1–125.7] |
| 7 | Keski-Suome | 252,398 | 190 | 75.3 [65.1–86.8] | 39 | 15.2 [10.8–20.9] | 229 | 90.6 [79.3–103.1] |
| 8 | Pohjois-Savo | 245,495 | 179 | 72.8 [62.7–84.1] | 40 | 16.3 [11.7–22.1] | 219 | 89.1 [77.9–101.6] |
| 9 | Itä-Savo | 42,407 | 27 | 64.1 [42.4–93.1] | 9 | 20.5 [9.3–39.2] | 36 | 84.6 [59.3–117.1] |
| 10 | Vaasa | 169,883 | 57 | 33.6 [25.5–43.5] | 64 | 37.8 [29.2–48.2] | 121 | 71.4 [59.4–85.2] |
| 11 | Etelä-Savo | 101,785 | 48 | 47.0 [34.8–62.2] | 11 | 11.1 [5.8–19.6] | 59 | 58.1 [44.4–74.8] |
| 12 | Satakunna | 219,512 | 62 | 28.2 [21.7–36.2] | 52 | 23.9 [18–31.3] | 114 | 52.2 [43.1–62.6] |
| 13 | Päijät-Hämee | 209,313 | 62 | 29.6 [22.8–37.9] | 28 | 13.4 [8.9–19.3] | 90 | 43.0 [34.6–52.9] |
| 14 | Keski-Pohjanmaa | 77,661 | 21 | 27.0 [17.0–41.1] | 8 | 10.1 [4.4–19.9] | 29 | 37.1 [25.0–53.3] |
| 15 | Kanta-Hämee | 173,245 | 38 | 21.9 [15.6–30.0] | 17 | 9.7 [5.7–15.6] | 55 | 31.6 [23.9–41.1] |
| 16 | Pirkanmaa | 531,303 | 110 | 20.7 [17.1–25.0] | 35 | 6.6 [4.7–9.2] | 146 | 27.4 [23.1–32.2] |
| 17 | Etelä-Pohjanmaa | 194,895 | 37 | 19.2 [13.5–26.3] | 5 | 2.6 [0.9–5.9] | 42 | 21.7 [15.7–29.3] |
| 18 | Pohjois-Pohjanmaa | 408,905 | 55 | 13.5 [10.5–17.3] | 24 | 5.9 [3.9–8.8] | 80 | 19.4 [15.6–24.0] |
| 19 | Lapi | 117,615 | 10 | 8.8 [4.3–16.0] | 4 | 3.7 [1.2–9.0] | 15 | 12.5 [7.0–20.6] |
| 20 | Länsi-Pohja | 62,108 | 4 | 6.2 [1.8–16.0] | 3 | 5.4 [1.3–14.9] | 7 | 11.5 [4.8–23.5] |
| 21 | Kainuu | 74,295 | 4 | 5.2 [1.6–13.3] | 2 | 3.1 [0.6–10.3] | 6 | 8.3 [3.3–17.7] |
| Total Finland | 5,501,777 | 3379 | 61.4 [59.4–63.5] | 2099 | 38.1 [36.5–39.8] | 5478 | 99.6 [97.0–102.2] | |
Note: Numbered HDs (#) correspond to the numbered areas in Fig. 2C.
CI, confidence interval; HDs, hospital districts; LB, Lyme borreliosis; NIDR, National Infectious Disease Register.