VetBact
VetBact logo

VetBact

Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Mesomycoplasma hyorhinis
Etymology: Genus name: between other mycoplasmas (fungus shaped).
Species epithet: from the pig nose.
Significance:Worldwide distribution.
  [Important]   
Alternative Species Name(s):Mycoplasma hyorhinis
Taxonomy:
Phylum
Tenericutes
Class
Mollicutes
Order
Mycoplasmoidales
Family
Metamycoplasmataceae 
Genus
Mesomycoplasma
Type Strain: BTS7 = ATCC 17981 = NCTC 10130.
Macromorphology (smell):
 
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.
Catalase/Oxidase:
Fermentation of carbohydrates: Glucose +
Spec. Char.: Optimal growth temperature: 37°C.
Disease:Arthritis and polyserositis in pigs from 3 up to 10 weeks of age.
Hosts: Pigs
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 

Taxonomy/phylogeny:
 
About 15 species have been described within the genus Mesomycoplasma. Mesomycoplasma hyorhinis is closely related to M. dispar, M. ovipneumoniae, M. hyopneumoniae as well as M. flocculare.

Note that the letter M in the phylogenetic tree (Fig. 37:2) can mean Mycoplasma, Mesomycoplasma, Metamycoplasma, Mycoplasmoides or Mycoplasmopsis.

Comment:Based on whole genome sequencing, the taxonomy of mycoplasmas has recently undergone a comprehensive revision. The new taxonomy is about to be introduced in VetBact, but it will still be possible to search for the alternative species names. Read more about the revised taxonomy of the mollicutes under the Term list of VetBact and see reference 164 below..

M. hyorhinis is often found as a contaminant of cell cultures.

Reference(s): No. 164
Updated:2021-12-02

News

The revised taxonomy of the mollicutes

The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

Recently Updated

Recent blog posts


Swedish University of Agricultural Sciences