Abstract
Growth of type strains of 23 mycoplasma species as well as field strains of M. hyorhinis was compared in aerobic and strict anaerobic cultivation. In anaerobic cultivation, the growth of five species including M. hyorhinis was suppressed, whereas that of other four species including M. hyosynoviae was enhanced. The remaining 14species showed similar growth in the two atmospheric conditions. While all anaerobically enhanced species belonged to arginine hydrolyzing mycoplasma group, anaerobically suppressed species were all arginine-non-hydrolyzers. In order to inhibit the growth of M. hyorhinis, rapid attainment of strict anaerobic condition was required. In a field survey, the anaerobic cultivation was shown to be effective for selective isolation of M. hyosynoviae from nasal cavities of pigs.
