Different forms of scrapie have been isolated by transmission to mice These strains cause variations in the incubation period and pattern of pathology observed in the infected animal As yet all BSE isolates have behaved as a single strain
The strain refers to the original tribe of the desert that bred the foundation lines of these horses Different tribes desired different looks and distinct types were created The strain is passed through the mare line in Bedouin pedigrees so strain is always determined by the tail female line When both the stallion and the mare are of the same strain the resulting offspring is said to be "pure in the strain" Some common strains found in Al Khamsa Arabian horses are Saglawi, Dahman, Kuhaylan, Hamdani & Abayyan
Different forms of the sheep TSE scrapie have been isolated by transmission to mice These strains cause variations in the incubation period and pattern of pathology observed in the infected animal As yet no strains of CJD have been identified