[Acute and chronic borreliosis transmitted by ticks in Europe].

Ticks are direct pathogenic agents, and also transmit some infectious diseases such as borreliosis. Clinical manifestations of borreliosis are multiple. They most often affect the skin, nervous system, joints and heart. Cutaneous pseudolymphomas, erythema chronicum migrans of Afzelius, acrodermatitis chronica atrophicans of Pick-Herxheimer, meningo-radiculitis and various arthropathies are the most commonly encountered diseases.