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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.
Definition. The host (also called the susceptible host) is the human body: someone who is at the risk of infection. Infections do not necessarily occur when pathogens enter the body of the person whose immune system is functioning normally.Whether or not a pathogen will result in infection depends upon several factors related to the host (the person exposed), the pathogen itself, and the environment.nfections do not necessarily occur when pathogens enter the body of the person whose immune system is functioning normally. Whether or not a pathogen will result in infection depends upon several factors related to the host (the person exposed), the pathogen itself, and the environment.