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A ( Species, Kingdom, Class, Genera ) is made up different species with important common features while ( species, genus, strain, subgroup ) is made up of collection of strains and belongs to the lowest level of taxa. ( Subgroups, Genotype, Strains, Taxa ) are genetic variability within species. Biovars are biochemical or physiological differences. Morphovars are morphologic differences and Serovars are differences in antigenic properties.