http://whqlibdoc.who.int/hq/2000/WHO_CDS_CSR_APH_2000.3.pdf
http://www.who.int/emc-documents/tse/whocdscsraph2003c.html

It provides guidance upon which infection control practitioners, healthcare practitioners, medical officers of health, and those involved in the care of persons suffering from TSE can base their care and infection control practices, to prevent events which are either extremely rare (e.g. transmission of TSE through a surgical procedure) or hypothetical (e.g. transmission of TSE to a healthcare worker or family member). Document in pdf format; Acrobat Reader required.