Spiroplasma strain HYOS-1was isolated from a tabanid fly, . The organism was serologically distinct from other spiroplasma species, groups, and subgroups and was recently designated the representative of spiroplasma group XXXI. The cells of strain HYOS-1, as determined by light microscopy, were long motile helices. Electron microscopic examination revealed wall-less cells delimited by a single membrane. The cells passed through 450- and 300-nm filter pores with a 10-fold reduction in titer, but failed to pass through 100-nm pores. Strain HYOS-1grew very well in most conventional medium formulations for spiro-plasmas or other mollicutes. The organism grew at temperatures ranging from 5 to 41°C, and the optimum temperature was 32°C. The doubling time at the optimum temperature was 0.7 h, one of the shortest values obtained for members of the genus . The strain catabolized glucose and hydrolyzed arginine but not urea. Growth of the organism was stimulated by cholesterol and serum, but the strain was nevertheless able to grow in the absence of sterols or serum. The guanine-plus-cytosine content of the DNA was about 28 ± 1 mol%, and the genome size was 1,225 kbp. On the basis of the experimental results reported here and previously reported data, group XXXI strain HYOS-1 (= ATCC 51745) is designated the type strain of a new species, .


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