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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. Definition. noun, plural: pathogens. An agent causing disease or illness to its host, such as an organism or infectious particle capable of producing a disease in another organism.Supplement. Pathogens are mostly microscopic, such as bacteria, viruses, protozoa, and fungi, thriving in various places such as air, dust, surfaces, soil, etc.Not all bacteria are pathogens, in fact most of them are harmless and only a few are pathogenic.upplement. Pathogens are mostly microscopic, such as bacteria, viruses, protozoa, and fungi, thriving in various places such as air, dust, surfaces, soil, etc. Not all bacteria are pathogens, in fact most of them are harmless and only a few are pathogenic.