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|Noun||1.||infective agent - an agent capable of producing infection|
virus - (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein
pathogen - any disease-producing agent (especially a virus or bacterium or other microorganism)
agent - an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"