Abstract
Serological and deoxyribonucleic acid-deoxyribonucleic acid homology studies were performed with PG2 and Donetta, the type strains of Mycoplasma agalactiae subsp. agalactiae Wroblewski 1931 and Mycoplasma agalactiae subsp. bovis Hale et al. 1962, respectively. It is concluded that the two subspecies should rather be regarded as two different species. It is proposed, therefore, that M. agalactiae subsp. bovis be elevated to the rank of species. The species name is M. bovis (Hale et al.) comb. nov.