Characteristics of patients with erythema migrans (EM) with associated leukopenia and/or thrombocytopenia, and patients with EM with normal blood cell count (controls).

EM, erythema migrans; ESR, erythrocyte sedimentation rate; AST, aspartate aminotransferase enzyme; ALT, alanine aminotransferase enzyme; TBE, tick-borne encephalitis.aCalculated for patients with one tick bite.bDuration of erythema migrans (as noticed by patient) prior to diagnosis.cOf 37 patients with leukopenia at the initial visit, 6 (16.2%) also had decreased blood lukocyte counts at the time of convalescet serum sampling.dOf 32 patients with thrombocytopenia at the initial visit, 8 (25%) also had decreased blood platelet counts at the time of convalescet serum sampling.