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a-f. Unsupervised principal component analysis for CSF (a, d, e) and serum (b, d, f). PCA plots for the different groups of patients who in addition to Borrelia were serologically positive or negative for tick-borne disease (TBI), furthermore the group serologically positive / negative for Borrelia spp. (Bo) and patients with elevated or normal fibrinogen as marker för inflammation (Inf) was generated, but no clear separation was seen in any of the PCA plots.
