an increasing trendP < 0.001
In southern (Kuusamo) and central (Sodankylä) Lapland, our model predicted an increasing trend from 1979 to 2015 for both the duration of the effective transmission period of S. tundra ( P < 0.001) and for the potential number of L3 S. tundra larvae being transmitted from an infectious reindeer ( P < 0.001).