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Seasonal activity of Ixodes ricinus nymphs by week of collection and incidence of TBE by week of onset. Data for 2001–2006 are compared using a 3-week shift in alignment. Spring-summer and summer-autumn periods are distinguished by the sharp drop in number of questing nymphs around week 22 and fall in near ground temperature to 10–12°C (Daniel et al., 2015).
