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. a pathogen may also be referred to as an infectious agent, or simply a germ . the term pathogen came into use in the s. [ ] [ ] typically, the term is used to describe an infectious microorganism or agent, such as a virus , bacterium , protozoan , prion , viroid , or fungus . [ ] [ ] [ ] small animals
, such as certain kinds of worms and insect larvae, can also produce disease. however, these animals are usually, in common parlance, referred to as parasites rather than pathogens. the scientific study of microscopic organisms, including microscopic pathogenic organisms, is called microbiology , while...
https://en.wikipedia.org/wiki/Pathogenic