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Comparative Study
. 1974;15(4):507-18.
doi: 10.1186/BF03547222.

Mycoplasm suipneumoniae and Mycoplasma flocculare in comparative pathogenicity studies

N F Friis
Comparative Study

Mycoplasm suipneumoniae and Mycoplasma flocculare in comparative pathogenicity studies

N F Friis. Acta Vet Scand. 1974.

Abstract
in English, Norwegian

Three field strains of Mycoplasma suipneumoniae each inoculated into 3 gnotobiotic piglets produced macro- and microscopic lung lesions typical of enzootic pneumonia in 8 of the animals. Under similar conditions 3 strains of M. flocculare produced typical macroscopic lung lesions in just 1 out of 9 animals. It is therefore concluded that M. flocculare is not of primary etiologic importance in the porcine enzootic pneumonia complex.

The frequency of successful reisolation from nasal cavities, lungs, and other tissues indicated that the lungs are the sole natural habitat for M. suipneumoniae, while for M. flocculare lungs as well as nasal cavities should be regarded as the natural habitat.

None of the organisms apparently spread via the blood stream. M. flocculare, but not M. suipneumoniae, induced histologic alterations of the nasal mucosa.

Tre nyisolerede stammer af Mykoplasma suipneumoniae hver podet på 3 gnotobiotiske grise fremkaldte i 8 af dyrene sådanne makroog mikroskopiske lungeforandringer, som er typiske for enzootisk pneumoni. I tilsvarende forsøg resulterede podning med 3 stammer af M. flocculare kun i opståen af lette, typiske makroskopiske lungeforandringer nos een af 9 grise. Derfor konkluderes, at M. flocculare er ikke af primser etiologisk betydning ved svinets enzootiske pneumoni.

Hyppigheden, med hvilken reisolationsforsøg lykkedes fra næsehuler, lunger samt andre lokaliteter, antydede, at lungerne er det eneste naturlige habitat for M. suipneumoniae; i modsætning til M. flocculare, for hvilken både lunger og næsehule må anses for at være det naturlige habitat.

Ingen af de 2 mykoplasma-arter syntes at spredes via blodbanerne. M. flocculare var i modsætning til M. suipneumoniae i stand til at fremkalde mikroskopiske forandringer i næsehulens slimhinde.

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References

    1. Friis N. F. Mycoplasmas cultivated from the respiratory tract of Danish pigs. Acta vet. scand. 1971;12:69–79. - PubMed
    1. Friis N. F. Mycoplasma hyorhinis as a causative agent in pneumonia of pigs. Acta vet. scand. 1971;12:116–119. - PubMed
    1. Friis N. F. Sensitivity of Mycoplasma suipneumoniae to penicillin-G. Acta vet. scand. 1971;12:120–121. - PubMed
    1. Friis N. F. Isolation and characterization of a new porcine mycoplasma. Acta vet. scand. 1972;13:284–286. - PMC - PubMed
    1. Friis N. F. The pathogenicity of Mycoplasma flocculare. Acta vet. scand. 1973;14:344–346. - PMC - PubMed

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