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Observed monthly densities of Ixodes ricinus nymphs infected with Borrelia burgdorferi s.l. (DIN; averaged for Helsinki green spaces) and primary borreliosis (erythema migrans) cases diagnosed in Helsinki in 2019. The grey line represents predicted tick activity patterns based on diagnosed cases, estimated with a 1‐month delay from tick bite to diagnosis. Note the different scales on y‐axes
