The occurrence of antibodies to C. burnetii and Chl. psittaci was studied in the herds of cattle transported from southern Moravia to the pastures of the Sumava Mountains. Q-fever persists in latent state in the cattle grazing in the Sumava Mts. and causes no manifest infections in man. The finding of the rickettsia in the small mammals and their ectoparasites documents the probability of contact with the causal agent in the excretions of cattle in the pastures. Veterinary and human medical services should be aware of a possibility of occurrence of Q-fever and chlamydiosis not only in southern Moravia but also in the Sumava Mts. and in other areas.