Table 3.
Densities of Ixodes ricinus nymphs and nymphs infected with Borrelia burgdorferi s.l. (DIN), and weighted infection risk estimates based on visitor count and population density data for study sites in south‐western Finland (A) and green spaces in the city of Helsinki (B). WGS84 coordinates are given for study sites outside of Helsinki; for sites in Helsinki, see Figure 1
| Study area | Coordinates | Nymphs/100 m2 | DIN (/100 m2) (year) | Visitor count (year) a | Weighted infection risk | Population density within (census year 2015) | Weighted infection risk based on population density | ||
|---|---|---|---|---|---|---|---|---|---|
| 500 m | 1 km | 500 m | 1 km | ||||||
| A. South‐western Finland | |||||||||
| Pähkinäinen | 60°19′42.0″N 21°41′17.9″E | 9.1 | 1.8 (2013) | 2,062 (2013) | 3.7 × 103 | 0 | 0 | 0 | 0 |
| Vepsä | 60°22′23.2″N 22°04′37.6″E | 0.7 | 0 (2013) | 10,000 (2013) | 0 | 0 | 0 | 0 | 0 |
| Maisaari | 60°19′45.3″N 21°53′50.2″E | 1.7 | 0.3 (2013) | 2,600 (2013) | 7.8 × 102 | 0 | 1 | 0 | 0.3 |
| Boskär | 60°02′02.0″N 21°46′13.8″E | 34.2 | 10.6 (2013) | 1,300 (2014) | 1.3 × 104 | 0 | 0 | 0 | 0 |
| Berghamn | 60°03′01.5″N 21°47′59.4″E | 7.75 | 0.04 (2013) | 3,000 (2014) | 1.2 × 102 | 4 | 5 | 0.2 | 0.2 |
| Seili | 60°14′19.6″N 21°57′37.5″E | 24 | 5.8 (2017) | 15,000 (2017) | 8.7 × 104 | 0 | 2 | 0 | 12 |
| Ruissalo B.G. b | 60°26′00.3″N 22°10′24.1″E | 9.9 | 3.6 (2019) | 104,000 (2019) | 3.7 × 105 | 13 | 42 | 47 | 1.5 × 102 |
| Askainen | 60°34′44.2″N 21°49′06.3″E | 2.3 | 0.3 (2014) | ‐ | ‐ | 0 | 2 | 0 | 0.6 |
| Rihtniemi | 61°03′58.4″N 21°19′16.5″E | 2.3 | 0.7 (2014) | ‐ | ‐ | 29 | 29 | 20 | 20 |
| Tvärminne | 59°50′31.6″N 23°12′06.3″E | 8.6 | 1 (2018) | ‐ | ‐ | 8 | 8 | 8 | 8 |
| B. Helsinki | |||||||||
| Hakuninmaa | 2.7 | 0.4 (2019) | ‐ | ‐ | 1,792 | 2,654 | 7.2 × 102 | 1.1 × 103 | |
| Lapinniemi | 2.1 | 0.2 (2019) | ‐ | ‐ | 9,838 | 22,634 | 2 × 103 | 4.5 × 103 | |
| Kumpula | 8.3 | 2.3 (2019) | ‐ | ‐ | 4,363 | 11,139 | 1 × 104 | 2.6 × 104 | |
| Laakso | 13.4 | 3 (2019) | ‐ | ‐ | 11,757 | 15,640 | 3.5 × 104 | 4.7 × 104 | |
| Lauttasaari | 4.3 | 0.9 (2019) | 208,000 (1995) | 1.9 × 105 | 3,808 | 8,586 | 3.4 × 103 | 7.7 × 103 | |
| Lehtisaari | 3 | 0.6 (2019) | 10,000 (1995) | 6 × 103 | 1,344 | 1,838 | 8.1 × 102 | 1.1 × 103 | |
| Meilahti | 3.4 | 1.2 (2019) | 700,000 (1995) | 8.4 × 105 | 4,226 | 7,099 | 5.1 × 103 | 8.5 × 103 | |
| Seurasaari | 0.9 | 0.4 (2019) | 700,000 (2019) | 2.8 × 105 | 0 | 1,122 | 0 | 4.5 × 102 | |
a
Visitor count data sources reported in the Technical Appendix.
b
Ruissalo Botanical Garden.