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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Metamycoplasma hyosynoviae
Etymology: Genus name: besides Mycoplasma (fungus shaped).
Species epithet: from joint fluid of pig.
Significance:Worldwide distribution.
Alternative Species Name(s):Mycoplasma hyosynoviae
Type Strain: S16 = ATCC 25591 = NCTC 10167.
Macromorphology (smell): Forms small and very typical umbonated colonies ("fried egg appearance"), which can be observed in a microscope.
Micromorphology: The cells are coccoid to filamentous.
Gram +/Gram -:G-, but is normally not gram stained because the cells will then be fragmented.
Metabolism: Energy source: glucose (pH is decreased).
Other Enzymes: Urease -
Fermentation of carbohydrates: Glucose +
Spec. Char.: Lacks a cell wall. Optimal growth temperature: 37°C.
HostsDiseaseClinical picture
Pigs (10-30 weeks of age)PolyarthritisPolyarthritis (inflammation in several joints simultaneously) caused by M. hyosynoviae is self-limiting and causes transient lameness.
16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
U26730 S16T 1499  

About 25 species have been described within the genus Metamycoplasma.

Note that the letter M in the phylogenetic tree (Fig. 216:1) 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 has now been 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 also reference 164 below.
Reference(s): No. 164


New names of bacterial phyla

The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.

Published 2023-03-01. Read more...
The taxonomy of chlamydias

Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBact

Published 2023-03-15. Read more...

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