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In biology, a pathogen (Greek: ÏÎ¬Î¸Î¿Ï pathos âsuffering, passionâ and -Î³ÎµÎ½Î®Ï -genÄs âproducer ofâ) in the oldest and broadest sense is anything that can produce disease, a term which came into use in the 1880s.he host may be an animal, a plant, a fungus, or even another microorganism. There are several substrates including pathways where the pathogens can invade a host. The principal pathways have different episodic time frames, but soil contamination has the longest or most persistent potential for harboring a pathogen.
Good. There are six main types of disease causing agents or pathogens: prions, viruses, bacteria, protozoans, fungi, and macroparasites. These pathogens vary greatly in size and shape, and also in the type of diseases they cause in their host.Pathogens can be microscopic (too small to be seen with the unaided eye) or macroscopic (can be seen with the unaided eye).hese pathogens vary greatly in size and shape, and also in the type of diseases they cause in their host. Pathogens can be microscopic (too small to be seen with the unaided eye) or macroscopic (can be seen with the unaided eye).