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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.
Noun. (plural pathogens). ( 1 pathology, immunology) Any organism or substance, especially a microorganism, capable of causing disease, such as bacteria, viruses, protozoa or fungi. 2  Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease. (pathology, immunology) Any organism or substance, especially a microorganism, capable of causing disease, such as bacteria, viruses, protozoa or fungi. 2  Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease.