Prions are infectious agents that consist of protein, but no DNA or RNA, and seem to produce their deadly effects by duplicating their shapes and accumulating in tissues. They are thought to contribute to several progressive brain disorders, including mad cow disease and Creutzfeldt-Jakob disease. Viroids are single-stranded RNA pathogens that infect plants. Their presence can have a severe impact on the agriculture industry.
agent with the ability to cause disease
infectious particle that consists of proteins that replicate without DNA or RNA
normal prion protein
infectious form of a prion protein
plant pathogen that produces only a single, specific RNA