PSOROVIS The project responds to a demand from the sector of Belgian White Blue faced increasing problem of scabies. It is likely that the problem has a multifactorial origin, among others. genetic and environment are likely involved. a full epidemiological study will be conducted at company level, which will examine the existence or non-existence of the disease in herds. Now developed improved immunological and clinical istrumenten to define very sensitive phenotypes of the animal. will be monitored in a minimum of 1000 animals.