[Incidence of Borrelia in the common tick (Ixodes ricinus) in the area of the city of Brno].

During the period between July and October 1988 more than 1000 ticks Ixodes ricinus were collected at 16 sites in the town of Brno and examined by indirect immunofluorescence (IFA) for the presence of Borrelia. The positivity of the tick population in 13 localities varied between 0.9-18.6%, ticks from three localities were negative. The results confirm the diffuse character of the presence of Borrelia in ticks I. ricinus in the urban environment and the possibility of infection of the urban population in the very town may be assumed.