00304pam a2200109 a 4500020001700000041000500017082001300022100000900035245012500044260001700169300000800186  a9241547014c  h  a614bWHO  aWho.  aWHO Guidelines on tissue Infectivity Distribution in Transmissible Spongiform Encephalopathies       hTextual Documents  bW.H.O.c2006  a89.