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A virus is a self-assembling collection of proteins and genetic material, a bacteria is a free-living single cell and a protist is a complex organism consisting of multiple cells. Prions are mis-folded proteins, so they would be classified as none of the above. Their discovery in the 1970s by a researcher in California was dismissed until the discovery of BSE in cattle in the late 1980s in the United Kingdom, because they were a novel method of infection.

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13y ago

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