A subdivision of a species or subspecies distinguishable from other strains therein on the basis of antigenicity. SYN: serotype. [sero- + variant]
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se·ro·var (sērґo-var) a taxonomic subdivision of bacteria based on the kinds and combinations of constituent antigens present in the cell, or a formula expressing the antigenic analysis on which such a subdivision is based. Called also serotype. See also serogroup.Medical dictionary. 2011.