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A new mycoplasma species isolated from pneumonic lungs of calves (Mycoplasma dispar sp. nov.)

, : A new mycoplasma species isolated from pneumonic lungs of calves (Mycoplasma dispar sp. nov.). Journal of Medical Microbiology 3(1): 111-123

Many strains of this glucose-fermenting organism were isolated in an enriched glucose calf-serum (GS) medium from pneumonic lungs of calves, but not from healthy lungs of calves or cows. It could be isolated in medium free of known bacterial inhibitors, and when subcultured in this medium showed no evidence of reversion to bacterial forms The general characteristics of these strains were those of Mycoplasma; these included cultural and metabolic characters, morphological appearance in stained films and electron micrographs, growth inhibition by specific antiserum and a DNA base composition of 28.5% guanine + cytosine (GC) However, the group showed some unusual features including failure to pass readily through membrane filters of 450 nm pore diameter, poor growth in conventional mycoplasma media and production of atypical colonies on GS agar medium. The sero logical identity of strains classified as M. dispar was demonstrated by growth and metabolic inhibition tests. They were serologically distinct from other recognized bovine mycoplasms and from a wide range of mycoplasms from other sources.


PMID: 5465091

DOI: 10.1099/00222615-3-1-111

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