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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
a particular kind or species of matter with uniform properties

antigen go
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)

immunogen, immunizing agent go
any substance or organism that provokes an immune response (produces immunity) when introduced into the body

vaccine, vaccinum go
immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies

pneumococcal vaccine, Pneumovax
vaccine (trade name Pneumovax) effective against the 23 most common strains of pneumococcus

noun.artifact

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