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Joan Stephenson, PhD

JAMA. 2001;286:663.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

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.

They found that increases in the incidence of TBE were associated with a combination of climate-related factors that encourage survival, development, and activity of Ixodes ricinus, the tick that is the main vector of TBE and Lyme disease in Europe: consecutive mild winters, an early arrival of spring, a spring temperature range that favors the . . . [Full Text of this Article]

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