viirustest väiksem, valgust koosnev nakkushaigusetekitaja
causative agents of several infectious diseases such as scrapie (in sheep), kuru and Creutzfeld Jakob disease in man. Prions (proteinaceous infective particles) apparently contain no nucleic acid.
... methods of analysis, detection and control of chemical contaminants and existing or emerging pathogenic micro-organisms (such as viruses, bacteria, yeasts, fungi, parasites and new agents of the prion type including development of ante-mortem diagnostic tests for BSE and scrapie);
