Pathogen - a disease producing organism, Parasite - organism that lives in or on another organism, Cellular pathogen - a pathogen that is made up of cells e.g tapeworm. fungus or bacterium, Non-cellular pathogen - a pathogen that is not made up of cellse.g virus, prion etc, Host - organism living in a relationship with another organism, Primary host - the organism that a parasite lives in or on in its adult stage, Secondary host - the organism that a parasite lives in or on in its larval stage, Plagues - a contagious diseases that spread rapidly throughout a population and results in high mortality , Epidemic - a widespread occurrence of an infectious disease in a community at a particular time., Pandemic - A disease that is prevalent over a whole country or the world.,

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