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Overall ratio of the Borrelia species B. afzelii (B.a.), B. garinii (B.g.), B. burgdorferi sensu stricto (B.b.), B. valaisiana (B.v.), and B. lusitaniae (B.l.) in I. ricinus ticks in Europe. Fifty records with 3,273 positive ticks were included. The percentages of positive ticks per species for every single study are given. n.t., nontypeable; n.s., not significant; one asterisk, P < 0.05; two asterisks, P < 0.01; three asterisks, P < 0.001.
