Figure 1

Crude (red) and weighted (blue) seropositivity proportions with 95% confidence intervals of IgG and IgM antibodies against Borrelia burgdorferi s.l. IgG = Immunoglobulin G; IgM = Immunoglobulin M; We defined seropositivity as positive or equivocal ELISA screening test with positive confirmatory line blot immunoassay. We weighted our sample with the respective local age and sex distributions.