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Primary Pathogens are the microorganisms that cause diseases in healthy individual. Opportunistic Pathogens are the microorganisms that are ordinarily in contact with the host and cause disease when the host's resistance is low. Primary Pathogens are the microorganisms that cause diseases in healthy individual.
Pathogen. A pathogen or infectious agent is a microorganismâin the widest sense, such as a virus, bacterium, prion, or fungusâthat causes disease in its host. The host may be an animal, a plant, or even another microorganism.There are several substrates including pathways whereby pathogens can invade a host.iseases caused by organisms in humans are known as pathogenic diseases. Some of the diseases that a pathogen can cause are smallpox, influenza, mumps, measles, chickenpox, ebola and rubella. Not all pathogens are necessarily undesirable to humans.