At first time Dermatophilus (D.) congolensis-infection was diagnosed in Brandenburg in 3 sheep herds and in one horse, which had contact to diseased sheep. The causative agent was introduced from West-Germany probably. Cause of the disease was influenced by a longer rain period and by secondary infections through Staph. aureus var. ovis. The morbidity came up to 90%, the mortality of lambs was 10%. Clinical picture, diagnostic and control of the disease are described. Economical losses are caused by disturbances of the development and deaths of animals mainly. Treatment of sheep was successful with Terramycin LA or 200 mg Oxytetracycline by i.m. injection of 1 ml within 7 days. All isolated strains of D. congolensis caused beta-hemolysis and liquidation of Löffler-Medium (heated denatured serum of cattle), and gelatin and fermented glucose and fructose to acid.