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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Mycoplasmoides gallisepticum
Categories: Motile; notifiable diseases and bacteria
Etymology: Genus name: similar to mycoplasma (fungus shaped).
Species epithet: chicken poisoning (infecting).
Significance:  [Important]   
Alternative Species Name(s):Mycoplasma gallisepticum
Taxonomy:
Phylum
Tenericutes
Class
Mollicutes
Order
Mycoplasmoidales
Family
Mycoplasmoidaceae 
Genus
Mycoplasmoides
Type Strain: PG31 = ATCC 19610 = NCTC 10115.
Macromorphology (smell):
 
Forms small very typical umbonated colonies ("fried egg appearance"). The macro morphology can be observed in a microscope.
Micromorphology: Very small and flask-shaped. M. gallisepticum has gliding motility on surfaces.
Gram +/Gram -:G-, but is normally not gram stained because the cells will then be fragmented.
Metabolism: Facultatively anaerobic. Glucose fermenter.
Catalase/Oxidase:
Fermentation of carbohydrates: Glucose +
Spec. Char.: Lacks a cell wall.
Disease:Avian mycoplasmosis (Chronic respiratory disease in chickens and infectious sinusitis in turkey).
Hosts: Poultry
Clinical Picture: Chicken:reduced egg production. Turkey: reduced egg production and swollen paranasal sinuses.
Diagnostics:Cultivation and immunofluorescens, PCR.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_004829 0 996 422  

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
M22441 Not defined 1 519 

Taxonomy/phylogeny:
 
About 10 species have been described within the genus Mycoplasmoides. M. gallisepticum is rather closely related to M. pneumoniae. See the phylogenetic tree (Fig. 36:2) where M can mean Mycoplasma, Mesomycoplasma, Metamycoplasma, Mycoplasmoides or Mycoplasmopsis.
Legislation: Avian mycoplasmosis caused by M. gallisepticum is included in OIE's B-list of major animal diseases. The disease is notifyable in Sweden
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 also reference 164 below.
Reference(s): No. 29, 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...

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