ALRA - Thorgeirsdottir,S.; Georgsson,G.; Reynisson,E.; Sigurdarson,S.; Palsdottir,A. - Search for healthy carriers of scrapie: an assessment of subclinical infection of sheep in an Icelandic scrapie flock by three diagnostic methods and correlation with PrP genotypes. - Archives of Virology 2002 Apr; 147(4): 709-22