progressive, fatal nervous disease of sheep and goats. The aetiology is not known but recognized to be a proteinaceous infectious particle. Characterized by trembling, pruritus, wool loss, staggering and loss of condition. Incubation period can be several years., lammaste nakkushaigus, mida tekitab prioon. Haigusele on iseloomulik pikk (u 3-aastane) peiteaeg. Nähud: suurenenud erutuvus, tugev nahasügelus, kõhnumine, halvatus. Skreipi lõpeb surmaga. Haigus levib nii puutega kui ka vanematelt järglastele.