A biovar is a variant prokaryotic strain that differs physiologically or biochemically from other strains in a particular species.[1][2] Morphovars (or morphotypes) are those strains that differ morphologically. Serovars (or serotypes) are those strains that have antigenic properties that differ from other strains.
This is a list of biovars and strains of biovars listed at the NCBI Taxonomy database:[3]