Abstract
Seventy bovine mycoplasma strains recovered from cases of calf pneumonia, and all displaying the cultural characteristics of Mycoplasma dispar, were compared to the type strain of this species by the disc growth inhibition test, the metabolism inhibition test and indirect epi-immunofluorescence test applied to colonies on agar. Sixty-seven strains were found to be identical with M. dispar. The remaining three strains formed a distinct serogroup partially separate from the type strain of M. dispar, but the difference from the type strain was not considered great enough to warrant the establishment of a subspecies.
Keywords: mycoplasma dispar, bovine mycoplasmas
Sammendrag
Ialt 70 kvaegmykoplasmastammer, som alle var isoleret fra tilfaelde af kalvepneumonier, og som udviste de for M. dispar typiske kulturelle egenskaber, blev undersøgt serologisk for tilhørsforhold til denne species ved hjaelp af disk-vaeksthaemningsmetoden, stofskiftehaem-ningsmetoden og den indirekte epi-immunofluorescensmetode udført på kolonier på agar. Det fandtes, at 67 stammer kunne regelret identificeres som M. dispar. De resterende 3 stammer fandtes at udgøre en homogen serogruppe, som delvis adskilte sig fra typestammen af M. dispar. Den påviste forskel synes dog for ringe til at berettige saerskilt gruppering af de 3 stammer i en ny subspecies.
Det må derfor konkluderes, at danske stammer af M. dispar udgør en serologisk helhed, omend en vis heterogenitet er til stede.
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