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Learn about the various types of pathogens such as viruses, bacteria, viroids, and prions that can cause infections. Understand the structures and sizes of these disease-causing agents and how they impact different organisms.
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Viruses, bacteria, viroids, and prions can all cause infection. • Any disease-causing agent is called a pathogen. 1 nanometer (nm) = one billionth of a meter 100 nm eukaryotics cells10,000-100,000 nm viroids5-150 nm viruses50-200 nm prokaryotics cells200-10,000 nm prion2-10 nm
A virus is made of DNA or RNA and a protein coat. • non-living pathogen • can infect many organisms • A viroid is made only of single-stranded RNA. • causes disease in plants • passed through seeds or pollen
causes misfolding of other proteins • results in diseases of the brain • A prion is made only of proteins.
