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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.
In biology, a pathogen (Greek: ÏÎ¬Î¸Î¿Ï pathos suffering, passion and -Î³ÎµÎ½Î®Ï -genÄs producer of) or a germ in the oldest and broadest sense is anything that can produce disease; the term came into use in the 1880s.