[Lyme Borreliosis]

The epidemiology of Lyme borreliosis is described with stress laid on the relations between ticks as vectors and the animals which are the reservoir of borrelia infecting man. Other discussed problems include the possibility of infection of man, the seasonal character of new cases, the worldwide presence of Ixodes ticks and their species in various continents, the incidence of Lyme borreliosis in various countries.