Tickborne encephalitis (TBE) has substantially increased in Sweden since the mid-1980s, and scientists think they know why: global warming has fostered an increasingly mild, tick-friendly climate (Lancet. 2001;358:16-18).
The incidence of TBE has increased substantially in Stockholm County in central Sweden since 1984, a time that coincided with a shift toward a milder climate, with spring arriving an average of 12 days earlier in the mid-1990s compared with 1960. With this in mind, researchers at Stockholm University investigated whether the surge in TBE cases and climate change was linked.
Stephenson J. Some Like It Hotter. JAMA. 2001;286(6):663. doi:10.1001/jama.286.6.663