Among the mycoplasmal species commonly isolated from porcine lungs are and . The former organism is a proven agent of enzootic porcine pneumonia, whereas the latter organism is of little or no pathogenicity. These mycoplasmas show considerable antigenic cross-reactivity. The deoxyribonucleic acids of strain 11 and strain Ms42 (T = type strain) each had a guanine-plus-cytosine content of 33 mol%. We also determined the extent of deoxyribonucleic acid sequence homology as reflected in deoxyribonucleic acid-deoxyribonucleic acid hybridization values. Approximately 10% heterologous hybridization was observed. Thus, our data support the previous classification of these organisms as separate species within the genus .


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