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When Jenner introduced vaccination he knew nothing of the infectious agents that cause disease: it was not until late in the 19th century that Robert Kock proved that infectious diseases are caused by microorganisms, each one responsible for a particular disease, or pathology. We now recognize four broad categories of disease-causing [[microorganism]]s, or [[pathogen]]s: these are [[virus]]es; [[bacteria]]; pathogenic [[fungi]]; and other relatively large and complex eukaryotic organisms collectively termed [[parasite]]s.
When Jenner introduced vaccination he knew nothing of the infectious agents that cause disease: it was not until late in the 19th century that Robert Kock proved that infectious diseases are caused by microorganisms, each one responsible for a particular disease, or pathology. We now recognize four broad categories of disease-causing [[microorganism]]s, or [[pathogen]]s: these are [[virus]]es; [[bacteria]]; pathogenic [[fungi]]; and other relatively large and complex eukaryotic organisms collectively termed [[parasite]]s.
==See Also==
[[Koch's postulates]]
[[category:medicine]]
[[category:medicine]]