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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.
A pathogenic or an infectious disease is caused by an external infectious agent or pathogen such as viruses, bacteria, parasites and fungi. These pathogens are found in water, soil and air and a human body can be infected from drinking, eating or touching something infected with germs.xamples of a bacterial pathogenic disease are pneumonia and gonorrhea, while viral pathogenic diseases include influenza and measles. An example of a parasitic pathogenic disease is malaria, while an example of a fungal pathogenic disease is candidiasis. Deficiency diseases.