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134 patients with clinically, epidemiologically and serologically confirmed
disease have been examined. 89.5% of them had erythema chronicum migrans, 112 patients (83.6%) were known to have had tick bites. The majority of patients were white-collar workers and townspeople. Hungry ticks collected from plants were shown to contain B. burgdorferi. 497 foresters and animal farmers have been serologically examined, using an indirect immunofluorescence test. Antibodies to B. burgdorferi in diagnostic titres have been revealed in 15.3% of foresters and 17.8% of animal farmers.