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Species/Subspecies: Mycoplasma hyorhinis
Etymology: Genus name: fungus shaped. Species epithet: from the pig nose.
Significance:Worldwide distribution.
Type Strain: BTS7 = ATCC 17981 = NCTC 10130.
Macromorphology (smell):
Mycoplasma hyorhinis 
Forms small and atypical colonies, which lack a clearly defined nipple (no "fried egg appearance") and should be observed in a microscope.
Micromorphology: Very small and pleomorphic.
Gram +/Gram -:G-, but is normally not gram stained since the cells are fragile and fragmented by this staining method.
Fermentation of carbohydrates: Glucose +
Spec. Char.: Optimal growth temperature: 37°C.
Hosts: Pigs
Disease (Swedish):Artrit och polyserosit hos grisar från 3 till 10 veckors ålder.
Disease (English):Arthritis and polyserositis in pigs from 3 up to 10 weeks of age.
Clinical Picture: Fever, difficulty in breathing, paralysis and swollen joints.
Genome Sequence:
Acc-noStrainSize (bp)Genome
CP002669 MCLD 0 829 709 1c + 0 
Three strains have been sequenced, plasmids have not been found.

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF412982 BTS7T 1468 

 Mycoplasma hyorhinis
About 125 species have been described within the genus Mycoplasma. M. hyorhinis is closely related to M. dispar, M. ovipneumoniae, M. hyopneumoniae as well as M. flocculare and belongs to the M. neurolyticum cluster within the hominis group.
Comment:Often found as a contaminant of cell cultures.

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Swedish University of Agricultural Sciences